Final - Section 3

Question 1

What is the fugitive phenomena?

Answer 1

• Fruiting bodies come and go without warning

Question 2

How many different fungi cause fairy ring?

Answer 2

• The total number is unknown
• 11 are known in New Jersey

Question 3

How would we control a type-2 fairy ring?

Answer 3

• apply nitrogen or iron to mask symptoms
• remove fruiting bodies
• aggressive aerification
• applicationg of wetting agent and water it in

Question 4

What are the environmental parameters used to predict brown patch?

Answer 4

• 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

Question 5

Name the causal agents of Brown Patch and Yellow Patch.

Answer 5

• Rhizoctonia solani*
• Ceratobasidium cereale*

Question 6

Name the grass in which Brown Patch is the #1 disease.

Answer 6

it affects Colonail Bentgrass the worst

Question 7

What is a common sign and common symptom of Brown Patch on bentgrass?

Answer 7

Symptom - irregular shaped leaf lesion that are tan in the center with a reddish brown border

Sign - Smoke ring of mycelium on the surface.

Question 8

When is Yellow Patch active?

Answer 8

Cool Weather

45 - 65 degrees

Question 9

Name the swimming spore and survival spore of a water mold.

Answer 9

Zoo Spore

Oospore

Question 10

Why do Fungi have two names?

Answer 10

One is the Telemorph name and the other is their Anamorph name

Question 11

Name two weeds that are hosts of Yellow Tuft.

Answer 11

.Crab grass

Quack grass

Orchard grass

Question 12

Name two fungicides that are effective control of pythium diseases.

Answer 12

Subdue

Segway

Question 13

How does gray snow mold survive?

Answer 13

Wrinkled, Raisen-like Sclerotia survives in the thatch

Question 14

Why is Pink Snow Mold a bad name for the disease?

Answer 14

Because it doesn’t need snow to infect a plant

Question 15

How does Nitrogen affect snow molds?

Answer 15

If too much nitrogen is applied, it overstimulates the turf and makes it more susceptible to disease.

Question 16

Draw the spore of Michrodochium nivale.

Answer 16

.

Question 17

What is unique about the mycelium of Typhula incarnata?

Answer 17

It is Septate Mycelium and has Clamp Connections.

Question 18

List the principles of plant disease control.

Answer 18

• Exclusion
• Eradication
• Resistance
• Protection

Question 19

Define “mode of action”

Answer 19

How an active ingredient interferes with the growth and metabolism of the pest

Question 20

List two fungicide tactics that help reduce resistance problems.

Answer 20

Tank Mix multiple fungicides

Rotate Fungicides

Question 21

What isa good combination of fungicides for Rust?

Answer 21

Daconil and Heritage

Question 22

What rust spore stage do we find on turf?

Answer 22

Stage 2 and 3

Urediospores are most common

Question 23

When is Dollar Spot most active?

Answer 23

Warm Days and Cool Nights

Optimal temps are 60 - 85 deg.

Overcast skies, fog, dew

8 - 12 hours of continuos leaf wetness

Question 24

Define the symptoms of Gray Leaf Spot.

Answer 24

Small, Oval, Gray colored leaf lesions that have a purple border

Question 25

What abiotic stress can anthracnose be easily confused with?

Answer 25

Drought Stress

Question 26

Name 3 contact fungicides.

Answer 26

Daconil Captan Medallion Mancozeb

Question 27

Name 3 diseases that are problems under high fertility.

Answer 27

Typhula incarnata Michrodochium nivale Drechslera poae

Question 28

Name 3 diseases that are worse under short mowing.

Answer 28

Magnaporte poae Geaumannomyces graminis Rhizoctonia zeae Waitea circinata

Question 29

Describe the symptoms of Yellow Tuft.

Answer 29

Dime sized yellow spots on turf that turn into dime sized dead spots.

Question 30

Name the primary symptom of Anthracnose.

Answer 30

* General Thinning of turf, * Yellow if Poa and Bronze if Bentgrass.

Question 31

Why is it hard to control Anthracnose?

Answer 31

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.

Question 32

Describe the signs of Yellow Tuft.

Answer 32

* aseptate mycelium * Sporangia that produce Zoospores * Oospores

Question 33

Name the favored host for anthracnose.

Answer 33

Poa annua

Question 34

What is the OLD genus name for Leaf Spot and Melting Out fungi?

Answer 34

Helminthosporium

Question 35

Describe the Brown Patch leaf lesion.

Answer 35

Irregularly shaped with a tan center and reddish-brown border

Question 36

What environmental condition increases Gray Leaf Spot?

Answer 36

Hot Days - Cool Nights Extended Leaf Wetness

Question 37

Name two turfgrasses that are resistant to Summer Patch.

Answer 37

Cynodon Zoysia

Question 38

Name two diseases that are worse at High pH.

Answer 38

Magnaporthe poae Gaeumannomyces graminis

Question 39

Name 3 diseases that can be controlled by adding Nitrogen fertilizer.

Answer 39

Red Thread Anthracnose Leaf and Sheath Spot

Question 40

What golf course turf is a common host of Take-All?

Answer 40

.Agrostis spp.

Question 41

Describe the symptoms of Red Thread.

Answer 41

1 - 5" patches of Unthrifty, thinning turf

Question 42

Name the best two fungicides for Brown Patch.

Answer 42

Azoxystrobin Pyraclostrobin