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2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
2 Plant Health Care Fungal Pathogens Lecture
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2 Plant Health Care Fungal Pathogens Lecture

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  • Transcript

    • 1. Plant Health Care Fungal Pathogens Lecture
    • 2.  
    • 3. Fungi
      • Majority of fungi are NOT plant pathogens
      • Primarily survive on non-living organic material, are called SAPROPHYTES
      • The non-reproductive "body" of most fungi (called the vegetative phase) is composed of a mass of a fungal threads called HYPHAE (singular = HYPHA )
      • This mass of hyphae is called a MYCELIUM (plural = MYCELIA ). While an individual hypha is microscopic, mycelia are often visible with the naked eye.
    • 4. HYPHAE (singular = HYPHA ) are the threadlike structures that comprise the major body of a fungus. You can think of a hypha as a long tube. Many hyphae in a mass are called MYCELIUM (plural = MYCELIA ).
    • 5. Fungi Identification
      • Most fungi produce hyphae, as the one shown here, that have CROSS WALLS (Septa) (partitions dividing the tubes into individual cells)
      • presence or absence of cross walls can be important in distinguishing and identifying some plant pathogenic fungi.
    • 6. Fungal Fruiting Structures
      • Fungi produce a wide range of reproductive structures (generically called FRUITING BODIES )
      • Within fruiting bodies, a fungus produces spores
    • 7. Powdery Mildew Fruiting Bodies
      • Black – fruiting body
      • Red – sacks
      • Blue – spores
      • Green - appendages
    • 8. Phaeosphaeria spartinicola Pithomyces
    • 9. Spore (Botrytis)
    • 10. Group I – Primarily Affecting Leaves
      • Coryneum Blight
      • Early Blight
      • Fusarium Wilt
      • Marssonina Leaf Spot – example of fungal leaf spot
      • Powdery Mildew
      • Rust
      • Sooty Mold
    • 11. Blight Symptoms
      • When spots or lesions enlarge and merge so that large areas of a leaf are necrotic and diseased, then we call this a BLIGHT .
    • 12. Coryneum Blight
      • Affects stone fruits in Colorado
      • ‘ Shothole’ disease
      • Affects fruit, stems, and leaves
      • Small purple spots, fallout
    • 13. Coryneum Blight
      • Fruit symptoms
      • Rough scab-like distortions
      • Sunken grayish areas
      • Overwinters on buds or twigs
      • Early wet season
    • 14. Coryneum Blight http://www.coopext.colostate.edu/TRA/PLANTS/coryneumblight.html
    • 15. Coryneum Blight
      • Affects peaches, nectarines, sweet cherries, plums – Prunus species
      • Overwinters on buds or twigs
      • Early wet season promotes disease
      • Hard to eliminate with pesticides
      • Fall clean up, good air circulation, prune out damaged tissue
    • 16. Early Blight Tomato early blight target-like leaf spot 
      • Tomato early blight target like leaf spots
      • Starts with small spots
    • 17. Early Blight
    • 18. Early blight (Alternaria)
      • Affects many vegetables
      • Leaves, stems, fruit
      • Plant resistant varieties
      • Remove and destroy
    • 19. Early Blight Symptoms
      • Symptoms – brown on edges, leaves
      • Small holes, leaves missing
      • Brown spots – concentric rings
      • Cankers on stems
      • Leaf curl
      • Wilt
    • 20. Fusarium Wilt of Tomato
    • 21. Fusarium Wilt
      • Leaves turn yellow
      • Early leaf drop
      • Stems droop
      • Yellow leaf patches
      • Can be on one side of a plant
    • 22. Fusarium Wilt
      • Occurs in warm weather
      • Soil borne
      • Plant resistant varieties
      • Remove and destroy
    • 23. Fusarium Wilt of Tobacco
    • 24. Fusarium Root Rot
    • 25. Fusarium Wilt
    • 26. Fungal Leaf Spot
      • Redbud
    • 27. Marssonina leaf spot of Aspen
    • 28. Marssonina Leaf Spot of Poplar
    • 29. Marssonina leaf spot
      • Early spring
      • Affects poplars and cottonwoods, esp. aspen
      • Fall clean up
      • Prune out damage to stems
      • Can lead to cankers and die back if severe
    • 30. Powdery Mildew
      • The white that you see is a combination of hyphae and asexual spores.
      • ‘Powdery Mildew’ is a group of closely related fungi
      • Host specific
      • High humidity is the key
    • 31. Powdery Mildew on Lilac
    • 32. Powdery Mildew on Pumpkin
    • 33.  
    • 34. Powdery Mildew overwinters in Apple buds
      • Overwintering apple powdery mildew deforms the buds creating a feathered appearance (right) rather than a smooth round healthy bud (left).
    • 35. Powdery mildew on apple foliage
      • Powdery mildew symptoms on apple foliage (right), notice upward curling of leaves and white appearance. Healthy foliage (left).
    • 36. Powdery Mildew
      • Affects leaves
      • Occurs mid to late summer when evenings are cool and days are hot
      • Pesticides include sulfur, baking soda
      • Dislikes wet leaf surface
      • More abundant on lower leaves
      • Also occurs on fruit
    • 37. Powdery Mildew
      • Fall clean up
      • Good air circulation
    • 38. Rust
      • rusty-orange, powdery PUSTULES
      • Easily rubbed off
      • Often requires two hosts
    • 39. Rust
      • Produces gelatinous masses & cups of discolored and distorted tissue
      • Remove and destroy seriously affected plants
      • Good air circulation, resistant varieties
      • Avoid wetting leaves
      • Don’t plant both hosts together
    • 40. Rust
      • Affects leaves – pale yellow spots, drop early
      • Stems
      • Fruit have yellow spots that turn orange
      • Fungicides, copper, sulfur
      • Avoid nitrogen fertilizer
    • 41. May Apple Rust
    • 42. Rose Rust
    • 43. Rust on Spruce
    • 44. Rust on Lawn & Shoes
    • 45. Cedar Apple Rust
    • 46.  
    • 47.  
    • 48. Cedar Apple Rust
      • Also called Juniper – Hawthorne Rust
      • Plant alternate hosts 4 miles apart
      • Destroy the galls before winter
      • Copper based fungicides, minimal effect
    • 49. Sooty Mold Linden
    • 50. Sooty Mold
      • Control insect producing the honeydew
      • Can be wiped off
      • Black or gray-green non-parasitic fungus
    • 51. Scale & Sooty Mold on Pine
    • 52.  
    • 53. Group II – Primarily Affecting Stems
      • Anthracnose
      • Botrytis Blight
      • Cytospora Canker
      • Verticillium Wilt
    • 54. Cankers
      • Lesions that occur on the stems of herbaceous plants or on the trunks and branches of woody plants are called CANKERS
      • Often cankers are sunken and discolored, or, as in this example of a canker disease on honey locust, the outer bark layer has totally fallen away.
      http://www.plantpath.wisc.edu/PDDCEducation/MasterGardener/General/Slide15.htm
    • 55. Anthracnose of Maple & Sycamore Enlarged leaf vein
    • 56. Anthracnose                                                                                   
    • 57. Anthracnose on Twig
    • 58. Anthracnose
      • Affects leaves, stems, fruit, entire plant
      • Occurs early spring
      • Symptoms appear on young leaves as they emerge (confused with frost damage)
      • Older leaves turn brown
      • Dead areas occur along the leaf veins
      • Ends of twigs may be killed back 8-10 iches
    • 59. Anthracnose
      • Cancers may develop on the tree trunk and main branches
      • Fall clean up, improve air circulation
      • Plant resistant varieties
      • Prune out damage
    • 60. Botrytis Blight
    • 61. Botrytis Blight
      • Grey mold disease affects many plants
      • Cool rainy spring, temp around 60
      • Can affect every part of a plant except the roots
      • Remove and destroy damaged tissue
      • Avoid wet leaf surfaces
      • Fungal sprays
    • 62. Cytospora Canker in Aspen                             
    • 63. Cytospora Canker
      • Orange-stained bark and sap flow are indicative of early cytospora canker infection
    • 64. `
      • As infected tissue dies, pimple-like fruiting bodies called pycnidia form
    • 65. Cytospora Canker
      • Under moist conditions small orange tendrils of a jellylike material oozes from the pycnidia.
    • 66. Cytospora Canker in Spruce
    • 67. Cytospora Canker Symptoms
      • Yellowing, wilting and dieback of new shoots
      • Bark discoloration
      • Gummosis
      • Orange or amber colored ‘ooze’
      • Cankers
      • ‘Wound parasite’
    • 68. Cytospora Canker
      • Common on willow, aspen, cottonwood, maple, stone fruits, spruce
      • Avoid stress & injury
      • Prune out damage if you can without creating another wound
    • 69. Fungal Canker Nectria galligena on apple
    • 70. Lantern canker on birch with nail
    • 71. Vascular Wilt
      • Vascular wilt pathogens invade the plant's water-conducting tissue (called the XYLEM ).
      • These pathogens either cause blockages in the xylem themselves
      • or the plant itself blocks off the xylem in an effort to localize the pathogen.
    • 72. Verticillium Wilt
      • Cool weather
      • Early in the season
      • Enters through wounds
      • Affects wide range of woody & herbaceous plants
      • Tomato, alfalfa, raspberries, strawberries, potatoes, eggplant
    • 73. Symptoms
      • Slight yellow on foliage
      • Discoloration of wood
      • Cankers may form on branches
      • Staining of sapwood
      • Leaves V shaped yellowing, widest on leaf margins
      • Stems droop
      • Plant dies
    • 74. Prevention
      • Soil borne – soil sterilization (?)
      • Resistant varieties
      • Prevent wounding
    • 75. Verticillium Wilt of Maple
      • VASCULAR DISCOLORATION or BROWNING
    • 76. Verticillium Wilt
    • 77. Verticillium Wilt – Tomato
    • 78. Group III - Primarily Affecting Roots
      • Pythophera
      • Rhizoctonia
    • 79. Phytophthora Root Rot
    • 80. Phytophthora Root Rot
      • Soil borne and seed borne
      • Disbursed by splashing, heavy rains or irrigation and run off from plant to plant
      • Need well drained soil
    • 81. Phytophthora symptoms
      • Dark streaks up the stem
      • Stunting
      • Reduced roots
      • Dead feeder roots
      • Death of plant
    • 82. Phytophthora Root Rot
      • Bordeaux mix when the weather is cool
      • Destroy infected plants
      • Prune out damaged material
      • Purchase phytophthora free plants
    • 83. Phytophthora Root Rot                                                                                            
    • 84. Phytophthora Stem Rot
    • 85. Phytophthera in Soy Beans
    • 86. Rhizoctonia
    • 87. Rhizoctonia
      • Affects roots & lower stems
      • Roots turn black or charcoal colored
      • Occurs in spring
      • Affects young plants or stressed older plants
      • Soil borne
    • 88. Rhizoctonia lesions                                         
    • 89. Group IV – Fungal Diseases of Turf
      • Ascochyta Leaf Blight
      • Dollar Spot
      • Fairy Rings
      • Melting Out Disease
      • Necrotic Ring Spot
    • 90. Ascochyta Leaf Blight
    • 91.  
    • 92. Ascochyta Leaf Blight
      • Affect tips of turf
      • Change watering practices
      • Aerate the turf
      • Affects Kentucky Bluegrass
    • 93. Dollar Spot http://www.ext.colostate.edu/ptlk/1522b.html
    • 94. Fairy Rings
    • 95. Melting Out Disease of Turf
    • 96. Melting Out
      • Occurs in spring
      • Band of discolored tissue in the middle of the leaf blade
      • Crowns can be rotten or red
      • Improve watering practices
      • Broad spectrum fungicides
      • Plant resistant varieties
    • 97. Necrotic Ring Spot
    • 98. Necrotic Ring Spot
      • Mid spring through fall
      • Affects Kentucky Bluegrass
      • Plant resistant varieties
      • Kills the crowns of the turf
      • Apply fungicide
      • Change watering practices
    • 99. Fungi for Test
      • Marssonina Leaf Spot
      • Powdery Mildew
      • Botrytis Blight
      • Cytospora Canker
      • Verticillium Wilt
      • Phytophthora Root Rot
      • Rhizoctonia
      • Aschochyta Leaf Blight
      • Dollar Spot
    • 100. Marssonina leaf spot of Aspen
    • 101. Marssonina Leaf Spot of Poplar
    • 102. Marssonina leaf spot
      • Early spring
      • Affects poplars and cottonwoods, esp. aspen
      • Fall clean up
      • Prune out damage to stems
      • Can lead to cankers and die back if severe
    • 103. Powdery Mildew
      • The white that you see is a combination of hyphae and asexual spores.
      • ‘Powdery Mildew’ is a group of closely related fungi
      • Host specific
      • High humidity is the key
    • 104. Powdery Mildew on Lilac
    • 105. Powdery Mildew on Pumpkin
    • 106.  
    • 107. Powdery Mildew overwinters in Apple buds
      • Overwintering apple powdery mildew deforms the buds creating a feathered appearance (right) rather than a smooth round healthy bud (left).
    • 108. Powdery mildew on apple foliage
      • Powdery mildew symptoms on apple foliage (right), notice upward curling of leaves and white appearance. Healthy foliage (left).
    • 109. Powdery Mildew
      • Affects leaves
      • Occurs mid to late summer when evenings are cool and days are hot
      • Pesticides include sulfur, baking soda
      • Dislikes wet leaf surface
      • More abundant on lower leaves
      • Also occurs on fruit
    • 110. Powdery Mildew
      • Fall clean up
      • Good air circulation
    • 111. Group 2 Affecting Stems
      • Botrytis Blight
      • Cytospora Canker
      • Verticillium Wilt
    • 112. Botrytis Blight
    • 113. Botrytis Blight
      • Grey mold disease affects many plants
      • Cool rainy spring, temp around 60
      • Can affect every part of a plant except the roots
      • Remove and destroy damaged tissue
      • Avoid wet leaf surfaces
      • Fungal sprays
    • 114. Cytospora Canker in Aspen                             
    • 115. Cytospora Canker
      • Orange-stained bark and sap flow are indicative of early cytospora canker infection
    • 116. Cytospora Canker
      • As infected tissue dies, pimple-like fruiting bodies called pycnidia form
    • 117. Cytospora Canker
      • Under moist conditions small orange tendrils of a jellylike material oozes from the pycnidia.
    • 118. Cytospera Canker in Spruce
    • 119. Cytospora Canker Symptoms
      • Yellowing, wilting and dieback of new shoots
      • Bark discoloration
      • Gummosis
      • Orange or amber colored ‘ooze’
      • Cankers
      • ‘Wound parasite’
    • 120. Cytospora Canker
      • Common on willow, aspen, cottonwood, maple, stone fruits, spruce
      • Avoid stress & injury
      • Prune out damage if you can without creating another wound
    • 121. Fungal Canker Nectria galligena on apple
    • 122. Lantern canker on birch with nail
    • 123. Verticillium Wilt
      • Cool weather
      • Early in the season
      • Enters through wounds
      • Affects wide range of woody & herbaceous plants
      • Tomato, alfalfa, raspberries, strawberries, potatoes, eggplant
    • 124. Symptoms
      • Slight yellow on foliage
      • Discoloration of wood
      • Cankers may form on branches
      • Staining of sapwood
      • Leaves V shaped yellowing, widest on leaf margins
      • Stems droop
      • Plant dies
    • 125. Prevention
      • Soil borne – soil sterilization (?)
      • Resistant varieties
      • Prevent wounding
    • 126. Verticillium Wilt of Maple
      • VASCULAR DISCOLORATION or BROWNING
    • 127. Verticillium Wilt
    • 128. Verticillium Wilt – Tomato
    • 129. Group III - Primarily Affecting Roots
      • Phytophthora
      • Rhizoctonia
    • 130. Phytophthora Root Rot
    • 131. Phytophthora Root Rot
      • Soil borne and seed borne
      • Disbursed by splashing, heavy rains or irrigation and run off from plant to plant
      • Need well drained soil
    • 132. Phytophthora symptoms
      • Dark streaks up the stem
      • Stunting
      • Reduced roots
      • Dead feeder roots
      • Death of plant
    • 133. Phytophthora Root Rot
      • Bordeaux mix when the weather is cool
      • Destroy infected plants
      • Prune out damaged material
      • Purchase phytophthora free plants
    • 134. Phytophthora Root Rot                                                                                            
    • 135. Phytophthora Stem Rot
    • 136. Phytophthera in Soy Beans
    • 137. Rhizoctonia
    • 138. Rhizoctonia
      • Affects roots & lower stems
      • Roots turn black or charcoal colored
      • Occurs in spring
      • Affects young plants or stressed older plants
      • Soil borne
    • 139. Rhizoctonia lesions                                         
    • 140. Group IV – Fungal Diseases of Turf
      • Ascochyta Leaf Blight
      • Dollar Spot
    • 141. Ascochyta Leaf Blight
    • 142. Ascochyta Leaf Blight
      • Affect tips of turf
      • Change watering practices
      • Aerate the turf
      • Affects Kentucky Bluegrass
    • 143. Ascochyta Leaf Blight
    • 144. Dollar Spot http://www.ext.colostate.edu/ptlk/1522b.html
    • 145. Dollar Spot
      • Appears as tan lesions on the turf blade
      • Surrounded by reddish brown borders
      • Indicates nitrogen deficiency and prolonged wetness
      • Overwinters in thatch and soil
    • 146.  
    • 147. Id from Photographs
    • 148.  
    • 149.  
    • 150.  
    • 151.  
    • 152.                                                                                            
    • 153.                             
    • 154.  
    • 155.  
    • 156.  

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