X-Message-Number: 23384 From: "Basie" <> Subject: What one can learn from frozen turf Date: Fri, 6 Feb 2004 00:55:38 -0500 TER at They Look What to do About Themby M. GRIFFIN, Agronomist, USGA Green Sectionturf problems can be deadly, unpre-in the sap solution and in intercellular spacesdictable, and the worst problems those whoas well as within the cell proper. When rapidwork with turf can encounter. The problemsfreezing occurs, ice crystals form within thethough, are not insoluable. We can examine howcell, and the protoplasm (the vital part of theturf is damaged during the winter and, wherecell) may become disorganized. Intercellular icepossible, explain what can be done to lessenof this kind will almost always cause severethe problem.damage or death.Turf Killed at Time of FreezingIf the plant has not had time to "harden"properly it may die at the initial freeze. In thiscase, the plant is rapidly growing and may bein a rather succulent condition with a high con-tent of water in its cellular structure. Water isWhen the plant is "hardened" by the gradualonset of cold weather and a slowing down of thegrowth process, the tissues lose much of theirfree water and the sap solution becomes moreconcentrated. Biochemical and biophysicalchanges cause the protoplasm to become hy-drated with water in a "bound" or unfreezableform and death is less likely to occur.Learnthe laNorthern Uniterinjury as severeWhat are theknown of their The ravagessix categories:MARCH 19702USGA GREEN SECTION RECORD ---- Page 2 When slow freezing occurs, water is slowlydrawn out of the cells and all freezable wateris crystallized in the intercellular spaces. Ifsuch a condition is not prolonged, the plant mayescape injury.Turf Killed at Time of ThawWhen freezing occurs, water is pulled fromthe cells and the cell wall is pulled inward. Theprotoplasm in the cell becomes plasmolized, orballed up. Unless the protoplasm is well sup-plied with bound or unfreezable water, it be-comes brittle. Upon thawing, water rushes backinto the cell through the highly permeable cellwall, and the protoplasm may be stretched andsubjected to shear forces sufficient to destroyit. Under these conditions, turf is killed at timeof thaw.Turf Killed While FrozenThe work done by Dr. Jack Le Bean, of bridge Experiment Station in Alberta, Canada,indicates that fungi in plants produce gaseswhile the plant is frozen. These gases may causedeath. This production of toxic gas and trafficon frozen turf are the two main causes of turfdeath while still in a frozen state.The most comprehensive work on ice sheetdamage has been done by Dr. James Beard ofMichigan State University. Some of the mech-anisms of ice sheet damage suggested by Dr.Beard are the depletion of oxygen, the accumu-lation of carbon dioxide and the leaching ofcellular constituents. Although Dr. Beard hasthus far reached no definite conclusions on thematter, his work indicates that direct effects oflow temperature may be more important thanany of the mechanisms of ice sheet damage.Turf Killed After ThawingMany of the common pathogens associatedwith winter injury are apparently very active,and their destruction may be most pronouncedjust after thawing begins and when the plantis striving to re-initiate growth.What Do When Occurs1. Water lightly and regularly until the plantcan re-establish its root system.2. Where no plant is left, replant followingwhatever renovation is possible with spiker andperhaps some vertical mowing or vertical slicing.3. Gentle treatment of the turf as if the en-tire damaged portion were all new seedlings,which in effect it is, is called for.When frozen soil begins to thaw, heaving mayWinter injury has been so widespread andalso occur. Heaving may cause a large portionsevere recently that numerous experiment sta-of the root system to be pulled off. If crowntions have begun to study the matter moretissue has also been damaged, little of the plantcritically. There has been a renewed interest inis left to support continued growth, and deathsoil warming by the use of electric heatingoccurs when the immediate energy supply iscables and in the use of various types of cover-exhausted.ings.Desiccation is the drying out of soil and planttissues. It may cause severe damage in winterif adequate moisture is not maintained. In theabsence of snow cover, moisture may be lostfrom frozen soil by sublimation. This means thatthe moisture may pass directly from solid togas without becoming a liquid which is of coursethe only form available to the plant. When thishappens, plants simply die from drought.Ice Win t Learn The Cause, Improve The Cureby JAMES W. TIMMERMAN, Agronomist, USGA Green Sectionthe last five years, golf courses in theNorthern United States have experienced winterinjury as severe as any in history.What are the causes of winterkill and what isknown of their destructive action?The ravages of winter are easily classed intosix categories:ASSOCIATED ICE SHEET DAMAGEThe extensive damage suffered from ices h e e t s d u r i n g t h e 1 9 6 1 - 6 2 w i n t e r s e a s o nprompted considerable research. Investigatedcauses of ice sheet damage include:1. Oxygen suffocation under the ice sheet.MARCH 19703TER at They Look What to do About Themby M. GRIFFIN, Agronomist, USGA Green Sectionturf problems can be deadly, unpre-in the sap solution and in intercellular spacesdictable, and the worst problems those whoas well as within the cell proper. When rapidwork with turf can encounter. The problemsfreezing occurs, ice crystals form within thethough, are not insoluable. We can examine howcell, and the protoplasm (the vital part of theturf is damaged during the winter and, wherecell) may become disorganized. Intercellular icepossible, explain what can be done to lessenof this kind will almost always cause severethe problem.damage or death.Turf Killed at Time of FreezingIf the plant has not had time to "harden"properly it may die at the initial freeze. In thiscase, the plant is rapidly growing and may bein a rather succulent condition with a high con-tent of water in its cellular structure. Water isWhen the plant is "hardened" by the gradualonset of cold weather and a slowing down of thegrowth process, the tissues lose much of theirfree water and the sap solution becomes moreconcentrated. Biochemical and biophysicalchanges cause the protoplasm to become hy-drated with water in a "bound" or unfreezableform and death is less likely to occur.Learnthe laNorthern Uniterinjury as severeWhat are theknown of their The ravagessix categories:MARCH 19702USGA GREEN SECTION RECORD ---- Page 2 When slow freezing occurs, water is slowlydrawn out of the cells and all freezable wateris crystallized in the intercellular spaces. Ifsuch a condition is not prolonged, the plant mayescape injury.Turf Killed at Time of ThawWhen freezing occurs, water is pulled fromthe cells and the cell wall is pulled inward. Theprotoplasm in the cell becomes plasmolized, orballed up. Unless the protoplasm is well sup-plied with bound or unfreezable water, it be-comes brittle. Upon thawing, water rushes backinto the cell through the highly permeable cellwall, and the protoplasm may be stretched andsubjected to shear forces sufficient to destroyit. Under these conditions, turf is killed at timeof thaw.Turf Killed While FrozenThe work done by Dr. Jack Le Bean, of bridge Experiment Station in Alberta, Canada,indicates that fungi in plants produce gaseswhile the plant is frozen. These gases may causedeath. This production of toxic gas and trafficon frozen turf are the two main causes of turfdeath while still in a frozen state.The most comprehensive work on ice sheetdamage has been done by Dr. James Beard ofMichigan State University. Some of the mech-anisms of ice sheet damage suggested by Dr.Beard are the depletion of oxygen, the accumu-lation of carbon dioxide and the leaching ofcellular constituents. Although Dr. Beard hasthus far reached no definite conclusions on thematter, his work indicates that direct effects oflow temperature may be more important thanany of the mechanisms of ice sheet damage.Turf Killed After ThawingMany of the common pathogens associatedwith winter injury are apparently very active,and their destruction may be most pronouncedjust after thawing begins and when the plantis striving to re-initiate growth.What Do When Occurs1. Water lightly and regularly until the plantcan re-establish its root system.2. Where no plant is left, replant followingwhatever renovation is possible with spiker andperhaps some vertical mowing or vertical slicing.3. Gentle treatment of the turf as if the en-tire damaged portion were all new seedlings,which in effect it is, is called for.When frozen soil begins to thaw, heaving mayWinter injury has been so widespread andalso occur. Heaving may cause a large portionsevere recently that numerous experiment sta-of the root system to be pulled off. If crowntions have begun to study the matter moretissue has also been damaged, little of the plantcritically. There has been a renewed interest inis left to support continued growth, and deathsoil warming by the use of electric heatingoccurs when the immediate energy supply iscables and in the use of various types of cover-exhausted.ings.Desiccation is the drying out of soil and planttissues. It may cause severe damage in winterif adequate moisture is not maintained. In theabsence of snow cover, moisture may be lostfrom frozen soil by sublimation. This means thatthe moisture may pass directly from solid togas without becoming a liquid which is of coursethe only form available to the plant. When thishappens, plants simply die from drought.Ice Win t Learn The Cause, Improve The Cureby JAMES W. TIMMERMAN, Agronomist, USGA Green Sectionthe last five years, golf courses in theNorthern United States have experienced winterinjury as severe as any in history.What are the causes of winterkill and what isknown of their destructive action?The ravages of winter are easily classed intosix categories:ASSOCIATED ICE SHEET DAMAGEThe extensive damage suffered from ices h e e t s d u r i n g t h e 1 9 6 1 - 6 2 w i n t e r s e a s o nprompted considerable research. Investigatedcauses of ice sheet damage include:1. Oxygen suffocation under the ice sheet.MARCH 19703TER at They Look What to do About Themby M. GRIFFIN, Agronomist, USGA Green Sectionturf problems can be deadly, unpre-in the sap solution and in intercellular spacesdictable, and the worst problems those whoas well as within the cell proper. When rapidwork with turf can encounter. The problemsfreezing occurs, ice crystals form within thethough, are not insoluable. We can examine howcell, and the protoplasm (the vital part of theturf is damaged during the winter and, wherecell) may become disorganized. Intercellular icepossible, explain what can be done to lessenof this kind will almost always cause severethe problem.damage or death.Turf Killed at Time of FreezingIf the plant has not had time to "harden"properly it may die at the initial freeze. In thiscase, the plant is rapidly growing and may bein a rather succulent condition with a high con-tent of water in its cellular structure. Water isWhen the plant is "hardened" by the gradualonset of cold weather and a slowing down of thegrowth process, the tissues lose much of theirfree water and the sap solution becomes moreconcentrated. Biochemical and biophysicalchanges cause the protoplasm to become hy-drated with water in a "bound" or unfreezableform and death is less likely to occur.Learnthe laNorthern Uniterinjury as severeWhat are theknown of their The ravagessix categories:MARCH 19702USGA GREEN SECTION RECORD ---- Page 2 When slow freezing occurs, water is slowlydrawn out of the cells and all freezable wateris crystallized in the intercellular spaces. Ifsuch a condition is not prolonged, the plant mayescape injury.Turf Killed at Time of ThawWhen freezing occurs, water is pulled fromthe cells and the cell wall is pulled inward. Theprotoplasm in the cell becomes plasmolized, orballed up. Unless the protoplasm is well sup-plied with bound or unfreezable water, it be-comes brittle. Upon thawing, water rushes backinto the cell through the highly permeable cellwall, and the protoplasm may be stretched andsubjected to shear forces sufficient to destroyit. Under these conditions, turf is killed at timeof thaw.Turf Killed While FrozenThe work done by Dr. Jack Le Bean, of bridge Experiment Station in Alberta, Canada,indicates that fungi in plants produce gaseswhile the plant is frozen. These gases may causedeath. This production of toxic gas and trafficon frozen turf are the two main causes of turfdeath while still in a frozen state.The most comprehensive work on ice sheetdamage has been done by Dr. James Beard ofMichigan State University. Some of the mech-anisms of ice sheet damage suggested by Dr.Beard are the depletion of oxygen, the accumu-lation of carbon dioxide and the leaching ofcellular constituents. Although Dr. Beard hasthus far reached no definite conclusions on thematter, his work indicates that direct effects oflow temperature may be more important thanany of the mechanisms of ice sheet damage.Turf Killed After ThawingMany of the common pathogens associatedwith winter injury are apparently very active,and their destruction may be most pronouncedjust after thawing begins and when the plantis striving to re-initiate growth.What Do When Occurs1. Water lightly and regularly until the plantcan re-establish its root system.2. Where no plant is left, replant followingwhatever renovation is possible with spiker andperhaps some vertical mowing or vertical slicing.3. Gentle treatment of the turf as if the en-tire damaged portion were all new seedlings,which in effect it is, is called for.When frozen soil begins to thaw, heaving mayWinter injury has been so widespread andalso occur. Heaving may cause a large portionsevere recently that numerous experiment sta-of the root system to be pulled off. If crowntions have begun to study the matter moretissue has also been damaged, little of the plantcritically. There has been a renewed interest inis left to support continued growth, and deathsoil warming by the use of electric heatingoccurs when the immediate energy supply iscables and in the use of various types of cover-exhausted.ings.Desiccation is the drying out of soil and planttissues. It may cause severe damage in winterif adequate moisture is not maintained. In theabsence of snow cover, moisture may be lostfrom frozen soil by sublimation. This means thatthe moisture may pass directly from solid togas without becoming a liquid which is of coursethe only form available to the plant. When thishappens, plants simply die from drought.Ice Win t Learn The Cause, Improve The Cureby JAMES W. TIMMERMAN, Agronomist, USGA Green Sectionthe last five years, golf courses in theNorthern United States have experienced winterinjury as severe as any in history.What are the causes of winterkill and what isknown of their destructive action?The ravages of winter are easily classed intosix categories:ASSOCIATED ICE SHEET DAMAGEThe extensive damage suffered from ices h e e t s d u r i n g t h e 1 9 6 1 - 6 2 w i n t e r s e a s o nprompted considerable research. Investigatedcauses of ice sheet damage include:1. Oxygen suffocation under the ice sheet.MARCH 19703TER at They Look What to do About Themby M. GRIFFIN, Agronomist, USGA Green Sectionturf problems can be deadly, unpre-in the sap solution and in intercellular spacesdictable, and the worst problems those whoas well as within the cell proper. When rapidwork with turf can encounter. The problemsfreezing occurs, ice crystals form within thethough, are not insoluable. We can examine howcell, and the protoplasm (the vital part of theturf is damaged during the winter and, wherecell) may become disorganized. Intercellular icepossible, explain what can be done to lessenof this kind will almost always cause severethe problem.damage or death.Turf Killed at Time of FreezingIf the plant has not had time to "harden"properly it may die at the initial freeze. In thiscase, the plant is rapidly growing and may bein a rather succulent condition with a high con-tent of water in its cellular structure. Water isWhen the plant is "hardened" by the gradualonset of cold weather and a slowing down of thegrowth process, the tissues lose much of theirfree water and the sap solution becomes moreconcentrated. Biochemical and biophysicalchanges cause the protoplasm to become hy-drated with water in a "bound" or unfreezableform and death is less likely to occur.Learnthe laNorthern Uniterinjury as severeWhat are theknown of their The ravagessix categories:MARCH 19702USGA GREEN SECTION RECORD ---- Page 2 When slow freezing occurs, water is slowlydrawn out of the cells and all freezable wateris crystallized in the intercellular spaces. Ifsuch a condition is not prolonged, the plant mayescape injury.Turf Killed at Time of ThawWhen freezing occurs, water is pulled fromthe cells and the cell wall is pulled inward. Theprotoplasm in the cell becomes plasmolized, orballed up. Unless the protoplasm is well sup-plied with bound or unfreezable water, it be-comes brittle. Upon thawing, water rushes backinto the cell through the highly permeable cellwall, and the protoplasm may be stretched andsubjected to shear forces sufficient to destroyit. Under these conditions, turf is killed at timeof thaw.Turf Killed While FrozenThe work done by Dr. Jack Le Bean, of bridge Experiment Station in Alberta, Canada,indicates that fungi in plants produce gaseswhile the plant is frozen. These gases may causedeath. This production of toxic gas and trafficon frozen turf are the two main causes of turfdeath while still in a frozen state.The most comprehensive work on ice sheetdamage has been done by Dr. James Beard ofMichigan State University. Some of the mech-anisms of ice sheet damage suggested by Dr.Beard are the depletion of oxygen, the accumu-lation of carbon dioxide and the leaching ofcellular constituents. Although Dr. Beard hasthus far reached no definite conclusions on thematter, his work indicates that direct effects oflow temperature may be more important thanany of the mechanisms of ice sheet damage.Turf Killed After ThawingMany of the common pathogens associatedwith winter injury are apparently very active,and their destruction may be most pronouncedjust after thawing begins and when the plantis striving to re-initiate growth.What Do When Occurs1. Water lightly and regularly until the plantcan re-establish its root system.2. Where no plant is left, replant followingwhatever renovation is possible with spiker andperhaps some vertical mowing or vertical slicing.3. Gentle treatment of the turf as if the en-tire damaged portion were all new seedlings,which in effect it is, is called for.When frozen soil begins to thaw, heaving mayWinter injury has been so widespread andalso occur. Heaving may cause a large portionsevere recently that numerous experiment sta-of the root system to be pulled off. If crowntions have begun to study the matter moretissue has also been damaged, little of the plantcritically. There has been a renewed interest inis left to support continued growth, and deathsoil warming by the use of electric heatingoccurs when the immediate energy supply iscables and in the use of various types of cover-exhausted.ings.Desiccation is the drying out of soil and planttissues. It may cause severe damage in winterif adequate moisture is not maintained. In theabsence of snow cover, moisture may be lostfrom frozen soil by sublimation. This means thatthe moisture may pass directly from solid togas without becoming a liquid which is of coursethe only form available to the plant. When thishappens, plants simply die from drought.Ice Win t Learn The Cause, Improve The Cureby JAMES W. TIMMERMAN, Agronomist, USGA Green Sectionthe last five years, golf courses in theNorthern United States have experienced winterinjury as severe as any in history.What are the causes of winterkill and what isknown of their destructive action?The ravages of winter are easily classed intosix categories:ASSOCIATED ICE SHEET DAMAGEThe extensive damage suffered from ices h e e t s d u r i n g t h e 1 9 6 1 - 6 2 w i n t e r s e a s o nprompted considerable research. Investigatedcauses of ice sheet damage include:1. Oxygen suffocation under the ice sheet.MARCH 19703TER at They Look What to do About Themby M. GRIFFIN, Agronomist, USGA Green Sectionturf problems can be deadly, unpre-in the sap solution and in intercellular spacesdictable, and the worst problems those whoas well as within the cell proper. When rapidwork with turf can encounter. The problemsfreezing occurs, ice crystals form within thethough, are not insoluable. We can examine howcell, and the protoplasm (the vital part of theturf is damaged during the winter and, wherecell) may become disorganized. Intercellular icepossible, explain what can be done to lessenof this kind will almost always cause severethe problem.damage or death.Turf Killed at Time of FreezingIf the plant has not had time to "harden"properly it may die at the initial freeze. In thiscase, the plant is rapidly growing and may bein a rather succulent condition with a high con-tent of water in its cellular structure. Water isWhen the plant is "hardened" by the gradualonset of cold weather and a slowing down of thegrowth process, the tissues lose much of theirfree water and the sap solution becomes moreconcentrated. Biochemical and biophysicalchanges cause the protoplasm to become hy-drated with water in a "bound" or unfreezableform and death is less likely to occur.Learnthe laNorthern Uniterinjury as severeWhat are theknown of their The ravagessix categories:MARCH 19702USGA GREEN SECTION RECORD ---- Page 2 When slow freezing occurs, water is slowlydrawn out of the cells and all freezable wateris crystallized in the intercellular spaces. Ifsuch a condition is not prolonged, the plant mayescape injury.Turf Killed at Time of ThawWhen freezing occurs, water is pulled fromthe cells and the cell wall is pulled inward. Theprotoplasm in the cell becomes plasmolized, orballed up. Unless the protoplasm is well sup-plied with bound or unfreezable water, it be-comes brittle. Upon thawing, water rushes backinto the cell through the highly permeable cellwall, and the protoplasm may be stretched andsubjected to shear forces sufficient to destroyit. Under these conditions, turf is killed at timeof thaw.Turf Killed While FrozenThe work done by Dr. Jack Le Bean, of bridge Experiment Station in Alberta, Canada,indicates that fungi in plants produce gaseswhile the plant is frozen. These gases may causedeath. This production of toxic gas and trafficon frozen turf are the two main causes of turfdeath while still in a frozen state.The most comprehensive work on ice sheetdamage has been done by Dr. James Beard ofMichigan State University. Some of the mech-anisms of ice sheet damage suggested by Dr.Beard are the depletion of oxygen, the accumu-lation of carbon dioxide and the leaching ofcellular constituents. Although Dr. Beard hasthus far reached no definite conclusions on thematter, his work indicates that direct effects oflow temperature may be more important thanany of the mechanisms of ice sheet damage.Turf Killed After ThawingMany of the common pathogens associatedwith winter injury are apparently very active,and their destruction may be most pronouncedjust after thawing begins and when the plantis striving to re-initiate growth.What Do When Occurs1. Water lightly and regularly until the plantcan re-establish its root system.2. Where no plant is left, replant followingwhatever renovation is possible with spiker andperhaps some vertical mowing or vertical slicing.3. Gentle treatment of the turf as if the en-tire damaged portion were all new seedlings,which in effect it is, is called for.When frozen soil begins to thaw, heaving mayWinter injury has been so widespread andalso occur. Heaving may cause a large portionsevere recently that numerous experiment sta-of the root system to be pulled off. If crowntions have begun to study the matter moretissue has also been damaged, little of the plantcritically. There has been a renewed interest inis left to support continued growth, and deathsoil warming by the use of electric heatingoccurs when the immediate energy supply iscables and in the use of various types of cover-exhausted.ings.Desiccation is the drying out of soil and planttissues. It may cause severe damage in winterif adequate moisture is not maintained. In theabsence of snow cover, moisture may be lostfrom frozen soil by sublimation. This means thatthe moisture may pass directly from solid togas without becoming a liquid which is of coursethe only form available to the plant. When thishappens, plants simply die from drought.Ice Win t Learn The Cause, Improve The Cureby JAMES W. TIMMERMAN, Agronomist, USGA Green Sectionthe last five years, golf courses in theNorthern United States have experienced winterinjury as severe as any in history.What are the causes of winterkill and what isknown of their destructive action?The ravages of winter are easily classed intosix categories:ASSOCIATED ICE SHEET DAMAGEThe extensive damage suffered from ices h e e t s d u r i n g t h e 1 9 6 1 - 6 2 w i n t e r s e a s o nprompted considerable research. Investigatedcauses of ice sheet damage include:1. Oxygen suffocation under the ice sheet.MARCH 19703TER at They Look What to do About Themby M. GRIFFIN, Agronomist, USGA Green Sectionturf problems can be deadly, unpre-in the sap solution and in intercellular spacesdictable, and the worst problems those whoas well as within the cell proper. When rapidwork with turf can encounter. The problemsfreezing occurs, ice crystals form within thethough, are not insoluable. We can examine howcell, and the protoplasm (the vital part of theturf is damaged during the winter and, wherecell) may become disorganized. Intercellular icepossible, explain what can be done to lessenof this kind will almost always cause severethe problem.damage or death.Turf Killed at Time of FreezingIf the plant has not had time to "harden"properly it may die at the initial freeze. In thiscase, the plant is rapidly growing and may bein a rather succulent condition with a high con-tent of water in its cellular structure. Water isWhen the plant is "hardened" by the gradualonset of cold weather and a slowing down of thegrowth process, the tissues lose much of theirfree water and the sap solution becomes moreconcentrated. Biochemical and biophysicalchanges cause the protoplasm to become hy-drated with water in a "bound" or unfreezableform and death is less likely to occur.Learnthe laNorthern Uniterinjury as severeWhat are theknown of their The ravagessix categories:MARCH 19702USGA GREEN SECTION RECORD ---- Page 2 When slow freezing occurs, water is slowlydrawn out of the cells and all freezable wateris crystallized in the intercellular spaces. Ifsuch a condition is not prolonged, the plant mayescape injury.Turf Killed at Time of ThawWhen freezing occurs, water is pulled fromthe cells and the cell wall is pulled inward. Theprotoplasm in the cell becomes plasmolized, orballed up. Unless the protoplasm is well sup-plied with bound or unfreezable water, it be-comes brittle. Upon thawing, water rushes backinto the cell through the highly permeable cellwall, and the protoplasm may be stretched andsubjected to shear forces sufficient to destroyit. Under these conditions, turf is killed at timeof thaw.Turf Killed While FrozenThe work done by Dr. Jack Le Bean, of bridge Experiment Station in Alberta, Canada,indicates that fungi in plants produce gaseswhile the plant is frozen. These gases may causedeath. This production of toxic gas and trafficon frozen turf are the two main causes of turfdeath while still in a frozen state.The most comprehensive work on ice sheetdamage has been done by Dr. James Beard ofMichigan State University. Some of the mech-anisms of ice sheet damage suggested by Dr.Beard are the depletion of oxygen, the accumu-lation of carbon dioxide and the leaching ofcellular constituents. Although Dr. Beard hasthus far reached no definite conclusions on thematter, his work indicates that direct effects oflow temperature may be more important thanany of the mechanisms of ice sheet damage.Turf Killed After ThawingMany of the common pathogens associatedwith winter injury are apparently very active,and their destruction may be most pronouncedjust after thawing begins and when the plantis striving to re-initiate growth.What Do When Occurs1. Water lightly and regularly until the plantcan re-establish its root system.2. Where no plant is left, replant followingwhatever renovation is possible with spiker andperhaps some vertical mowing or vertical slicing.3. Gentle treatment of the turf as if the en-tire damaged portion were all new seedlings,which in effect it is, is called for.When frozen soil begins to thaw, heaving mayWinter injury has been so widespread andalso occur. Heaving may cause a large portionsevere recently that numerous experiment sta-of the root system to be pulled off. If crowntions have begun to study the matter moretissue has also been damaged, little of the plantcritically. There has been a renewed interest inis left to support continued growth, and deathsoil warming by the use of electric heatingoccurs when the immediate energy supply iscables and in the use of various types of cover-exhausted.ings.Desiccation is the drying out of soil and planttissues. It may cause severe damage in winterif adequate moisture is not maintained. In theabsence of snow cover, moisture may be lostfrom frozen soil by sublimation. This means thatthe moisture may pass directly from solid togas without becoming a liquid which is of coursethe only form available to the plant. When thishappens, plants simply die from drought.Ice Win t Learn The Cause, Improve The Cureby JAMES W. TIMMERMAN, Agronomist, USGA Green Sectionthe last five years, golf courses in theNorthern United States have experienced winterinjury as severe as any in history.What are the causes of winterkill and what isknown of their destructive action?The ravages of winter are easily classed intosix categories:ASSOCIATED ICE SHEET DAMAGEThe extensive damage suffered from ices h e e t s d u r i n g t h e 1 9 6 1 - 6 2 w i n t e r s e a s o nprompted considerable research. Investigatedcauses of ice sheet damage include:1. Oxygen suffocation under the ice sheet.MARCH 19703TER at They Look What to do About Themby M. GRIFFIN, Agronomist, USGA Green Sectionturf problems can be deadly, unpre-in the sap solution and in intercellular spacesdictable, and the worst problems those whoas well as within the cell proper. When rapidwork with turf can encounter. The problemsfreezing occurs, ice crystals form within thethough, are not insoluable. We can examine howcell, and the protoplasm (the vital part of theturf is damaged during the winter and, wherecell) may become disorganized. Intercellular icepossible, explain what can be done to lessenof this kind will almost always cause severethe problem.damage or death.Turf Killed at Time of FreezingIf the plant has not had time to "harden"properly it may die at the initial freeze. In thiscase, the plant is rapidly growing and may bein a rather succulent condition with a high con-tent of water in its cellular structure. Water isWhen the plant is "hardened" by the gradualonset of cold weather and a slowing down of thegrowth process, the tissues lose much of theirfree water and the sap solution becomes moreconcentrated. Biochemical and biophysicalchanges cause the protoplasm to become hy-drated with water in a "bound" or unfreezableform and death is less likely to occur.Learnthe laNorthern Uniterinjury as severeWhat are theknown of their The ravagessix categories:MARCH 19702USGA GREEN SECTION RECORD ---- Page 2 When slow freezing occurs, water is slowlydrawn out of the cells and all freezable wateris crystallized in the intercellular spaces. Ifsuch a condition is not prolonged, the plant mayescape injury.Turf Killed at Time of ThawWhen freezing occurs, water is pulled fromthe cells and the cell wall is pulled inward. Theprotoplasm in the cell becomes plasmolized, orballed up. Unless the protoplasm is well sup-plied with bound or unfreezable water, it be-comes brittle. Upon thawing, water rushes backinto the cell through the highly permeable cellwall, and the protoplasm may be stretched andsubjected to shear forces sufficient to destroyit. Under these conditions, turf is killed at timeof thaw.Turf Killed While FrozenThe work done by Dr. Jack Le Bean, of bridge Experiment Station in Alberta, Canada,indicates that fungi in plants produce gaseswhile the plant is frozen. These gases may causedeath. This production of toxic gas and trafficon frozen turf are the two main causes of turfdeath while still in a frozen state.The most comprehensive work on ice sheetdamage has been done by Dr. James Beard ofMichigan State University. Some of the mech-anisms of ice sheet damage suggested by Dr.Beard are the depletion of oxygen, the accumu-lation of carbon dioxide and the leaching ofcellular constituents. Although Dr. Beard hasthus far reached no definite conclusions on thematter, his work indicates that direct effects oflow temperature may be more important thanany of the mechanisms of ice sheet damage.Turf Killed After ThawingMany of the common pathogens associatedwith winter injury are apparently very active,and their destruction may be most pronouncedjust after thawing begins and when the plantis striving to re-initiate growth.What Do When Occurs1. Water lightly and regularly until the plantcan re-establish its root system.2. Where no plant is left, replant followingwhatever renovation is possible with spiker andperhaps some vertical mowing or vertical slicing.3. Gentle treatment of the turf as if the en-tire damaged portion were all new seedlings,which in effect it is, is called for.When frozen soil begins to thaw, heaving mayWinter injury has been so widespread andalso occur. Heaving may cause a large portionsevere recently that numerous experiment sta-of the root system to be pulled off. If crowntions have begun to study the matter moretissue has also been damaged, little of the plantcritically. There has been a renewed interest inis left to support continued growth, and deathsoil warming by the use of electric heatingoccurs when the immediate energy supply iscables and in the use of various types of cover-exhausted.ings.Desiccation is the drying out of soil and planttissues. It may cause severe damage in winterif adequate moisture is not maintained. In theabsence of snow cover, moisture may be lostfrom frozen soil by sublimation. This means thatthe moisture may pass directly from solid togas without becoming a liquid which is of coursethe only form available to the plant. When thishappens, plants simply die from drought.Ice Win t Learn The Cause, Improve The Cureby JAMES W. TIMMERMAN, Agronomist, USGA Green Sectionthe last five years, golf courses in theNorthern United States have experienced winterinjury as severe as any in history.What are the causes of winterkill and what isknown of their destructive action?The ravages of winter are easily classed intosix categories:ASSOCIATED ICE SHEET DAMAGEThe extensive damage suffered from ices h e e t s d u r i n g t h e 1 9 6 1 - 6 2 w i n t e r s e a s o nprompted considerable research. Investigatedcauses of ice sheet damage include:1. Oxygen suffocation under the ice sheet.MARCH 19703 Basie Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=23384