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Turf Diseases > Pythium Disease Complex > Flashcards

Pythium Disease Complex Flashcards

1
Q

Pythium Host

A

All turfgrasses

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2
Q

Most pythiums cause…

A

root and crown disease

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3
Q

Pythium is in what Kingdom?

A

Stramenopiles

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4
Q

Pythiaceous “fungi” hyphae is..

A

aseptate

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5
Q

Pythium Blight symptoms

A

dead ass grass
Cottony blight
“grease spot” blackened turf

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6
Q

Pythium moves with…

A

Water
Mowing
Feet

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7
Q

Pythium Blight Predisposing Factors

A 
• Hot weather 
– optimal +85F day / +70F night 
• Extended leaf wetness 
– +90% RH for >10 hours 
– poor air circulation 
– shade 
• Excessive nitrogen input 
• Seedlings 
• High seeding rates
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8
Q

Pythium grows from..

A

plant to plant

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9
Q

Pythium Blight Fertility Management

A

Balanced Fertility program
Adequate N inputs
-maintain growth
-avoid excess nitrogen, spoon feed

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10
Q

Pythium Blight disease management

A

KEEP IT DRY
Use irrigation judiciously; avoid drought, but
keep the foliage as dry as possible
• Improve drainage
• Prune trees to improve air circulation and
light penetration
• Mow when dry
• Use fans
• Aerify to reduce thatch and compaction
• Seed during cool weather

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11
Q

Pythium Chemical Class: phenylamides

A

mefenoxam, metylaxyl

Subdue Maxx,
Subdue

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12
Q

Pythium Chemical Class:QoI

A

azoxystrobin, fluoxastrobin

Heritage, Disarm

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13
Q

Pythium Chemical Class: aromatic hydrocarbons

A

ethazole

Terrazole

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14
Q

Pythium Chemical Class: QiI

A

cyazofamid

Segway

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15
Q

Pythium Chemical Class:carbamates

A

propamocarb

Banol, Stellar

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16
Q

Pythium Chemical Class:phosphonates

A

fosetyl-Al, phosphorous acid

Signature, Alude, Resyst

17
Q

Pythium Chemical Class: benzamides

A

fluopicolide

Stellar

18
Q

PB Chemical Control

A 
• Use penetrants on preventive 
basis – get out in front of 
predisposing conditions 
• Use contacts for “short term” 
knockdown 
• Apron for seed treatment
19
Q

Pythium Root Rot symptoms

A

irregular patterns, sometimes
in spots or patches, overall general thinning and
yellowing

20
Q

Pythium Root most severe in…

A

well-drained greens

21
Q

Will you see mycelium with Pythium Root Rot?

A

No

22
Q

PRR Predisposing Factors

A 
• Cool to- hot weather 
• Excess soil moisture 
− poor drainage 
− compaction 
• Poor site conditions 
− shade 
− poor air circulation 
• Collars and clean up areas
23
Q

PRR - fertility management

A 
• Maintain a balanced fertility program 
– soil test and adjust sufficiency levels of 
available nutrients as necessary 
• Maintain adequate N to inputs 
– maintain growth
– avoid excess nitrogen inputs and 
succulent turfgrass
24
Q

PRR - disease management

A

KEEP IT DRY!
• Use irrigation judiciously; avoid drought, but keep
the soil as dry as possible
• Prune trees to improve air circulation and light
penetration
• Use fans
• Improve drainage
• Aerify to reduce thatch and compaction
• Mow at recommended cutting heights
• Avoid mechanical damage and other stress factors

25
Q

PRR – chemical control

A

• Preventive
– applications of cyazofamid, ethazole, mefanoxam,
or propamocarb preceding periods of wet weather
watered-in with 1/8” of irrigation to move product
into root zone
• Curative
– ethazole followed 3 to- 5 days later by a penetrant
(cyazofamid, mefanoxam, propamocarb) watered-in
with 1/8” of irrigation to move product into root
zone

26
Q

Pythium Root Disfunction cause

A

Pythium volutum

27
Q

PRD symptoms

A

Kills grass in spring
diffuse patches
thin patches in summer

28
Q

PRD reduces

A

plants ability to absorb water and nutrients

29
Q

PRD - predisposing factors

A

• root infection occurs during fall and spring
– 50 to- 75ºF soil temperatures
• roots die during heat and drought stress
• most severe on new construction
• other conducive conditions:
– low fertility input: especially nitrogen
– low mowing heights
– infrequent aerification: thatch, layering

30
Q

PRD - fertility management

A 
• Maintain a balanced fertility program 
– soil test and adjust sufficiency levels of 
available nutrients as necessary 
• Maintain adequate N to inputs 
– maintain growth 
– avoid excess nitrogen inputs and 
succulent turfgrass
31
Q

PRD - disease management

A

KEEP IT DRY!

32
Q

PRD - chemical control

A

• Rotation
– Insignia (0.9 oz, watered-in)
– Segway (0.9 fl oz, watered-in)
– Signature + Banol (4 + 2 oz) or Signature + Subdue
Maxx (4 + 1 oz)
• Preventative Schedule
– 21 to 28 days between applications when mean
daily soil temperatures are between 50ºF and 75ºF
• Curative Schedule
– 14 to 28 days between applications as needed
based on symptom expression

Turf Diseases (2 decks)

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