Final - Section 3 Flashcards
What is the fugitive phenomena?
- Fruiting bodies come and go without warning
How many different fungi cause fairy ring?
- The total number is unknown
- 11 are known in New Jersey
How would we control a type-2 fairy ring?
- apply nitrogen or iron to mask symptoms
- remove fruiting bodies
- aggressive aerification
- applicationg of wetting agent and water it in
What are the environmental parameters used to predict brown patch?
- Warm Nights
- Soil temperature > 61 deg
- Air temperature > 59 deg.
- Extended Leaf Wetness
- 95% RH for > 10 hours
- 0.1” of rain or irrigation in preceeding 36 hours
Name the causal agents of Brown Patch and Yellow Patch.
- Rhizoctonia solani*
- Ceratobasidium cereale*
Name the grass in which Brown Patch is the #1 disease.
it affects Colonail Bentgrass the worst
What is a common sign and common symptom of Brown Patch on bentgrass?
Symptom - irregular shaped leaf lesion that are tan in the center with a reddish brown border
Sign - Smoke ring of mycelium on the surface.
When is Yellow Patch active?
Cool Weather
45 - 65 degrees
Name the swimming spore and survival spore of a water mold.
Zoo Spore
Oospore
Why do Fungi have two names?
One is the Telemorph name and the other is their Anamorph name
Name two weeds that are hosts of Yellow Tuft.
.Crab grass
Quack grass
Orchard grass
Name two fungicides that are effective control of pythium diseases.
Subdue
Segway
How does gray snow mold survive?
Wrinkled, Raisen-like Sclerotia survives in the thatch
Why is Pink Snow Mold a bad name for the disease?
Because it doesn’t need snow to infect a plant
How does Nitrogen affect snow molds?
If too much nitrogen is applied, it overstimulates the turf and makes it more susceptible to disease.
Draw the spore of Michrodochium nivale.
.
What is unique about the mycelium of Typhula incarnata?
It is Septate Mycelium and has Clamp Connections.
List the principles of plant disease control.
- Exclusion
- Eradication
- Resistance
- Protection
Define “mode of action”
How an active ingredient interferes with the growth and metabolism of the pest
List two fungicide tactics that help reduce resistance problems.
Tank Mix multiple fungicides
Rotate Fungicides
What isa good combination of fungicides for Rust?
Daconil and Heritage
What rust spore stage do we find on turf?
Stage 2 and 3
Urediospores are most common
When is Dollar Spot most active?
Warm Days and Cool Nights
Optimal temps are 60 - 85 deg.
Overcast skies, fog, dew
8 - 12 hours of continuos leaf wetness
Define the symptoms of Gray Leaf Spot.
Small, Oval, Gray colored leaf lesions that have a purple border
What abiotic stress can anthracnose be easily confused with?
Drought Stress
Name 3 contact fungicides.
Daconil
Captan
Medallion
Mancozeb
Name 3 diseases that are problems under high fertility.
Typhula incarnata
Michrodochium nivale
Drechslera poae
Name 3 diseases that are worse under short mowing.
Magnaporte poae
Geaumannomyces graminis
Rhizoctonia zeae
Waitea circinata
Describe the symptoms of Yellow Tuft.
Dime sized yellow spots on turf that turn into dime sized dead spots.
Name the primary symptom of Anthracnose.
- General Thinning of turf,
- Yellow if Poa and Bronze if Bentgrass.
Why is it hard to control Anthracnose?
Becaue it is usually on the Putting Green.
Raising the HOC, minimizing mowing, adding nitrogen to promote growth and keeping traffic to a minimum is hard to do on a golf course that has different expectations.
Describe the signs of Yellow Tuft.
- aseptate mycelium
- Sporangia that produce Zoospores
- Oospores
Name the favored host for anthracnose.
Poa annua
What is the OLD genus name for Leaf Spot and Melting Out fungi?
Helminthosporium
Describe the Brown Patch leaf lesion.
Irregularly shaped with a tan center and reddish-brown border
What environmental condition increases Gray Leaf Spot?
Hot Days - Cool Nights
Extended Leaf Wetness
Name two turfgrasses that are resistant to Summer Patch.
Cynodon
Zoysia
Name two diseases that are worse at High pH.
Magnaporthe poae
Gaeumannomyces graminis
Name 3 diseases that can be controlled by adding Nitrogen fertilizer.
Red Thread
Anthracnose
Leaf and Sheath Spot
What golf course turf is a common host of Take-All?
.Agrostis spp.
Describe the symptoms of Red Thread.
1 - 5” patches of Unthrifty, thinning turf
Name the best two fungicides for Brown Patch.
Azoxystrobin
Pyraclostrobin
