plant diseases chapter 4 section vii of the pest bear & affiliates service personnel development...
TRANSCRIPT
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Plant Diseases
Chapter 4
Section VII
of the
Pest Bear & AffiliatesService Personnel Development Program
2005
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Select the disease you wish to learn about by “clicking” on the respective title in the Table of Contents on the following
page.
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To properly understand the diseases affecting turf, you must understand five things about each disease:
1) Who the host or hosts are
2) What is the pathogen that causes the disease
3) How do you make a diagnosis of the disease
4) What environmental factors are favored by the disease
5) How can the disease be controlled using management cultural controls
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Contents• Anthracnose
• Brown Patch
• Dollar Spot
• Fairy Ring
• Gray Leaf Spot
• Gray Snow Mold
• Helminthosporium
• Necrotic Ring Spot
• Nematodes
• Pink Snow Mold
• Powdery Mildew
• Pythium Blight
• Red Thread
• Rust
• Spring Dead Spot
• Stripe Smut
• Summer Patch
• Take-All Patch
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Anthracnose
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Anthracnose - Hosts
Creeping bentgrass
Bluegrass
Fescue
Perennial ryegrass
Bermudagrass
Centipedgrass
St Augustinegrass
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Anthracnose - Hosts
Annual Bluegrass is particularly susceptible
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Anthracnose - Pathogen
• Colletotrichum graminicola
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Anthracnose - Diagnosis
• Grass turns yellow to brown in irregular shaped patches of turf
• Leaf lesions are yellow with black centers
• Brown to black hairs (setae) may be observed on leaves or crown with aid of 10x magnification
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Anthracnose - Environment
Found in temperatures >78° F
More than 10 hours of leaf wetness per day for several days
Particularly severe on turf exposed to soil compaction and excessive thatch
Pathogen may cause crown rot in creeping bentgrass at temperatures of 60°-77°F
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Anthracnose – Managementcultural controls
Disease will be more severe under low nitrogen conditions
Maintain balanced fertility throughout the growing season
Use light weight mowing equipment to reduce compaction
Limit thatch thickness
Decrease shade and increase air circulation to reduce wetness
Avoid irrigation in late afternoon or evening prior to midnight
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AnthracnoseCompleted
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Brown Patch
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Brown Patch - Hosts
• All common turfgrass species are susceptible to Brown Patch
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Brown Patch - Pathogen
• Rhizoctonia solani
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Brown Patch - Diagnosis
• Cool-season turfgrasses: circular patches of brown turf a few inches to several feet in diameter
• Leaves have gray, irregular-shaped lesions with thin brown borders
• Patches are surrounded by smoky-colored ring or mycelium on close-cut turf
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Brown Patch - Diagnosis
• Warm-season turfgrasses: leaf sheathes at margins of patches are brown to black
• Dark brown lesions may be visible on stolons
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Brown Patch - Environment
Night temperature > 60°F for cool season grasses and 50- 60°F for warm season grasses
More than 10 hours of leaf wetness per day for several days
Disease is severe at low mowing heights
Disease can be severe on poorly drained soils
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Brown Patch– Managementcultural controls
Disease may be more severe on lush turf with excessive nitrogen and low phosphorus and potassium
Maintain balanced fertility throughout the growing season
Decrease shade and increase air circulation to enhance drying of the turf
Avoid irrigation in late afternoon or in evening prior to midnight
Limit thatch thickness
Mow at recommended height
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Brown Patch Completed
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Dollar Spot
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Dollar Spot - Hosts
• All common turfgrass species are hosts for Dollar Spot
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Dollar Spot - Pathogen
• Sclerotinia homeocarpa
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Dollar Spot - Diagnosis
• Straw-colored patches of turf 1-3 inches in diameter
• White mycelium may be associated with patches when turf is wet
• Straw-colored lesions extend across leaf blades
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Dollar Spot - Environment
Night temperatures > 50°F and day temperatures < 90 °F
More than 10 hours of leaf wetness per day for several days
Disease is severe on turf which is subjected to drought stress
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Dollar Spot – Managementcultural controls
Disease may be more severe under low nitrogen fertility
Maintain balanced fertility throughout the growing season
Limit thatch thickness
Decrease shade and increase air circulation to enhance drying of the turf
Avoid irrigation in late afternoon or in evening prior to midnight
Avoid drought stress
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Dollar SpotCompleted
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Fairy Ring
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Fairy Ring - Hosts
• All common grass species are hosts for Fairy Ring
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Fairy Ring - Pathogen
• Several species of “mushroom-forming” fungi
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Fairy Ring - Diagnosis
• Circles or arcs of mushrooms or wilted, dead or dark green turf
• White mats of fungal mycelium may be found in thatch or soil associated with circles or arcs
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Fairy Ring - Environment
Light to moderate textured soils are favored
Soil usually has a pH of 5-7.5
Low to moderate soil moisture
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Fairy Ring – Managementcultural controls
Maintain moderate nitrogen fertility
Maintain moderate to high levels of phosphorus and potassium according to soil tests
Excavate ring and soil 12 inches deep and 24 inches beyond ring or arch and replace with new soil
Remove sod, cultivate soil 6-8 inches deep in several directions, add wetting agent to soil, reseed or sod
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Fairy RingCompleted
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Nematodes
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Nematodes - Hosts
• All common grass species are hosts for nematodes
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Nematodes - Pathogen
• More than 15 different species of nematodes attack turfgrasses
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Nematodes - Diagnosis
• Irregular shaped light green or yellow patches of turf which may be several feet in diameter
• Leaves may be yellow or brown from the tip
• Roots may be thin, stunted or knotted
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Nematodes - Environment
Soil temperatures of >40° F
Symptoms are often severe on turf growing in sandy or light-textured soils
Symptoms may be enhanced by drought and high temperatures of >80°F
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Nematodes – Managementcultural controls
Maintain balanced fertility throughout the growing season
Maintain moderate to high levels of phosphorus and potassium according to soil tests
Have soil analyzed for nematodes prior to seeding or sodding
Use sod that is nematode free
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NematodesCompleted
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Pythium Blight
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Pythium Blight - Hosts
• All common turfgrass species are susceptible to Pythium Blight
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Pythium Blight - Pathogen
• Pythium aphanidermatum and other species of Pythium
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Pythium Blight - Diagnosis
• Greasy brown patches of turf an inch or less in diameter, increasing to several inches and turning straw colored
• Grey-white, cottony mycelium observed in the early morning
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Pythium Blight - Environment
Night temperature > 65°F
More than 10 hours of leaf wetness per day for several days
Poor surface and subsurface drainage
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Pythium Blight– Managementcultural controls
Disease may be more severe under excessive nitrogen conditions
Maintain balanced fertility throughout the growing season
Maintain optimum plant calcium levels
Decrease shade and increase air circulation to enhance drying of the turf
Avoid irrigation in late afternoon or in evening prior to midnight
Improve surface and subsurface drainage
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Pythium Blight Completed
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Gray Snow Mold
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• All cool season grasses
• Bentgrass
• Annual Bluegrass
• Perennial Ryegrass
Gray Snow Mold - Hosts
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Bentgrass, Annual Bluegrass, and Perennial Ryegrass are particularly susceptible
Gray Snow Mold - Hosts
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Gray Snow Mold - Pathogen
• Typhula incarnate
• Typhula ishikarensis
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Gray Snow Mold - Diagnosis
• Circular straw-colored patches of turf usually less than 10” in diameter, evident after the snow melts
• Orange, brown to black sclerotia form on leaves
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Gray Snow Mold - Environment
Snow-cover is required for disease to develop
Disease is severe when snow cover exceeds 90 days
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Gray Snow Mold – Managementcultural controls
Avoid a fertility program that results in lush, fast-growing turf in late fall or winter
Maintain potassium levels according to soil tests
Prevent snow from accumulating excessively on turf areas
Prevent compaction of snow and remove snow in the spring
Use dark-colored fertilizer to melt snow in the spring
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Gray Snow MoldCompleted
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Necrotic Ring Spot
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Necrotic Ring Spot - Hosts
• Kentucky bluegrass
• Fine-leaf fescue
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Necrotic Ring Spot - Pathogen
• Leptosphaeria korrae
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Necrotic Ring Spot - Diagnosis
• Light-green to yellow patches of turf 3-5” in diameter
• Light-green turf turns brown to straw-colored
• Roots and rhizomes are brown to black
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Necrotic Ring Spot - Environment
Initiates at temperatures <80 degrees F in moist soil
Severity of symptoms increases with drought and temperatures >80 degrees F
Disease may be very severe in compacted soils
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Necrotic Ring Spot Completed
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Spring Dead Spot
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Spring Dead Spot - Hosts
• Bermudagrass
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Spring Dead Spot - Pathogen
• Species of Leptosphaeria, Ophiosphaerella, and Gaeumannomyces
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Spring Dead Spot - Diagnosis
• Circular patches of straw-colored turf up to several feet in diameter
• Evident after winter dormancy
• Roots at edges of patches are dark brown to black
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Spring Dead Spot - Environment
Disease is severe when the average daily temperature in November is <60 degrees F
Poor surface and sub-surface drainage
Thatch is > ½ inch thick
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Spring Dead Spot– Managementcultural controls
Maintain good potassium and low nitrogen levels in the late summer and early fall
Maintain a balanced fertility throughout the growing season
Maintain moderate to high levels of phosphorus, potassium, and minor elements according to soil tests
Improve surface and sub-surface drainage
Limit thatch thickness
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Spring Dead Spot Completed
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Red Thread
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Red Thread - Hosts
Bentgrass
Bluegrass
Fine-leaf fescue
Perennial ryegrass
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Red Thread - Hosts
Fine-leaf fescue, and Perennial Ryegrass are particularly susceptible
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Red Thread - Pathogen
• Laetisaria fuciformis
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Red Thread - Diagnosis
• Red-brown patches of turf 1-4” in diameter
• Pink-red mycelium grows from the tip of the infected leaf blades
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Red Thread - Environment
Cool temperatures, 40-70 degrees F
More than 10 hours of leaf wetness per day for several days
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Red Thread– Managementcultural controls
Disease is more severe with low nitrogen fertility
Maintain balanced fertilization throughout the growing season
Maintain moderate to high levels of potassium and phosphorus
Avoid irrigations in late afternoon or evening
Mow at least once each week and remove diseased portion of leaf blades
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Red Thread Completed
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Powdery Mildew
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Powdery Mildew - Hosts
• Kentucky bluegrass
• Fine-leaf fescue
• Bermudagrass
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Powdery Mildew - Pathogen
• Erysiphe gramminis
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Powdery Mildew - Diagnosis
• White,powdery masses of fungal spores scattered over the surface of the leaves
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Powdery Mildew - Environment
Disease is severe in shaded areas at temperatures of 60-72 degrees F
High humidity is required for infection, but leaf wetness is not essential
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Powdery Mildew– Managementcultural controls
Disease is more severe under excessive nitrogen conditions
Maintain a balanced fertility program throughout the growing season
Reduce shade and increase air circulation
Plant shade tolerant grass
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Powdery Mildew Completed
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Helminthosporium Leaf Spot
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Helminthosporium Leaf Spot - Hosts
Bluegrass
Bentgrass
Fescue
Perennial ryegrass
Bahiagrass
Bermudagrass
Zoysia
Buffalograss
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Helminthosporium Leaf Spot - Pathogen
• Bipolaris sps.
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Helminthosporium Leaf Spot - Diagnosis
• Round to oval chocolate-brown spots on the leaves
• Spots may have tan centers
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Helminthosporium Leaf Spot - Environment
Temperatures of 77-95 degrees F
Disease severity increases with increases in temperature
More than 10 hours of leaf wetness per day for several days
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Helminthosporium Leaf Spot– Management
cultural controls
Avoid excessive nitrogen and maintain a balanced fertility in the growing season
Decrease shade and increase air circulation to enhance drying of the turf
Avoid late afternoon or evening irrigation
Limit thatch thickness and mow at recommended heights
Use light-weight mowing equipment to reduce stress
Plant resistant grasses
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Helminthosporium Leaf Spot Completed
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Gray Leaf Spot
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Gray Leaf spot - Hosts
• Most warm season turfgrasses
• St Augustine is particularly susceptible
• Ryegrasses and fescues may exhibit severe symptoms under prolonged warm, wet conditions
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Gray Leaf Spot - Pathogen
• Pyricularia grisea
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Gray Snow Mold - Diagnosis
• Round or oval gray spots on the leaves
• Spots surrounded by brown or yellow border
• Leaves may be blighted gray, usually from the tip downward
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Gray Leaf spot - Environment
Night temperatures of >70 degrees F
More than 10 hours of leaf wetness per day for several days
Disease is severe in shaded areas or during periods of extended overcast weather
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Gray Leaf Spot – Managementcultural controls
Disease is more severe under excess nitrogen fertility
Maintain a balanced fertility throughout the growing season
Decrease shade and increase air circulation to enhance drying of turf
Avoid irrigation in late afternoon and evening prior to midnight
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Gray Leaf SpotCompleted
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Rust
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Rust - Hosts
All common species of turfgrasses
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Rust - Pathogen
• Several species of Puccinia and Uromyces
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Rust - Diagnosis
• Red-brown powdery masses of spores on leaf blades or leaf sheaths
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Rust - Environment
Temperatures of 68-86 degrees F
Disease is severe un turf subjected to drought stress, low mowing, shade, or poor air circulation
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Rust– Managementcultural controls
Disease is more severe under low nitrogen conditions
Maintain a balanced fertility throughout the growing season
Reduce shade and increase air circulation
Mow at recommended heights
Avoid drought stress
Avoid irrigation in late afternoon and in evening prior to midnight
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Rust Spot Completed
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Pink Snow Mold
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Pink Snow Mold - Hosts
• All cool season turfgrasses
• Bentgrass, annual bluegrass and perennial ryegrass are particularly susceptible
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Pink Snow Mold - Pathogen
• Microdochium nivale
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Pink Snow Mold - Diagnosis
• Salmon colored to red-brown patches of turf 1-8 inches or more in diameter
• Common after 60 days or more of snow cover
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Pink Snow Mold - Environment
Disease is common after at least 60 days of snow cover
Pathogen can infect turf without snow cover
Disease is particularly severe when snow covers unfrozen ground
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Pink Snow Mold– Managementcultural controls
Disease is more sever on fast-growing lush turf that receives high nitrogen and low potassium in the fall
Maintain balanced fertility
Prevent snow compaction and prevent snow from accumulating
Melt snow in spring with organic fertilizers
Avoid applications of lime
Avoid irrigation at night and mow at the recommended height
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Pink Snow Mold Completed
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Summer Patch
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Summer Patch - Hosts
Bluegrasses and fine-leaf fescues
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Summer Patch - Pathogen
• Magnaporthe poae
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Summer Patch - Diagnosis
• Circular patches of wilted straw-colored turf
• Usually less than 10 inches in diameter
• Leaves turn yellow or brown starting at the tip
• Roots are light to dark brown
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Summer Patch - Environment
Day-time temperature >85 degrees F
High soil moisture
Poor surface or subsurface drainage
Low mowing height
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Summer Patch– Managementcultural controls
Maintain balanced fertility throughout the growing season
Improve surface and subsurface drainage
Reduce compaction
Syringe turf with water when temperature >85 degrees F
Mow at recommended height
Prevent stress
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Summer Patch Completed
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Take-All Patch
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Take-All Patch - Hosts
Only bentgrasses are highly susceptible
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Take-All Patch - Pathogen
• Gaeumannomyces graminis
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Take-All Patch - Diagnosis
• Wilted to bronze or brown circular patches of turf up to several feet in diameter
• Roots along margins of patches are dark brown
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Take-All Patch - Environment
Disease develops rapidly on cool, wet soils with pH >5.5
Disease can be more severe on sandy soils
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Take-All Patch– Managementcultural controls
Disease is more severe under low or unbalanced fertility conditions
Fertilize with acid-forming sources of nitrogen such as sulfur coated urea
Maintain moderate to high levels of phosphorus, potassium and minor elements according to soil tests
Improve surface and subsurface drainage
Avoid use of lime if soil pH >5.0
Avoid heavy, frequent irrigation
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Take-All Patch Completed
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Stripe Smut
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Stripe Smut - Hosts
• Bluegrass
• Bentgrass
• Fescue
• Perennial ryegrass
• Tall fescue
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Stripe Smut - Pathogen
• Ustilago striformis
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Stripe Smut - Diagnosis
• Yellow to black stripes from tips to base of leaf blade
• Black masses of spores form along the stripes
• Leaves turn brown from tips down and tips of leaves twist and curl
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Stripe Smut - Environment
Infection occurs at 50-68 degrees F
Sever symptoms are evident during drought and temperatures of >75 degrees F
Symptoms are often more severe on acid soils and on turf with excessive thatch
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Stripe Smut– Managementcultural controls
Disease is more severe on lush, overfertilized or thin, underfertilized turf
Maintain a balanced fertility throughout the growing season
Avoid drought stress
Apply lime if pH is <6
Limit thatch thickness
Mow to recommended heights
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Stripe Smut Completed
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