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Turfgrass Diseases > Final - Section 4 > Flashcards

Final - Section 4 Flashcards

1
Q

What is a common sign for brown patch on bentgrass?

A

Smoke Ring of hyphae

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2
Q

When is Yellow Patch active?

A

Cool Weather

45 - 65 degrees

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3
Q

What characteristic is unique for Pythium mycelium?

A

It is aseptate

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4
Q

What time of year can Pythium cause disease in turf?

A

It is active in Cool - Hot temperatures but causes plant disease in the hot months because the plant will suffer from heat and drought stress.

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5
Q

Name two fungicides that will NOT control Pythium.

A

Azoxystrobin

Pyraclostrobin

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6
Q

How does Nitrogen affect snow molds?

A

Excess nitrogen makes the turf more susceptible to disease

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7
Q

What management practice may increase Basal Crown Rot?

A

Short HOC

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8
Q

Name the Favored host for Anthracnose.

A

Poa annua

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9
Q

What effect does Nitrogen have on Leaf Spot and Melting Out?

A

Excess nitrogen makes the plant more susceptible to disease

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10
Q

What environmental condition increases Gray Leaf Spot?

A

ALternating period of weat and dry in the heat

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11
Q

Draw the conidia of the leaf spot fungus.

A

.

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12
Q

What single cultural approach can we use to reduce the severity of all patch diseases?

A

Mow at reccomended cutting heights

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13
Q

What fertilizer strategy can we use to control Summer Patch and Take-All?

A

Avoid Nitrate nitrogen sources

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14
Q

What turf is the common host for Take-All.

A

.Agrostis spp.

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15
Q

What two fungicides are effective against water molds?

A

Heritage

Segway

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16
Q

Name two diseases that have Smoke Ring symptoms.

A

Rhizoctonia solani

Waitea circinata

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17
Q

Name the piercing mouthpart of a nematode.

A

stylet

18
Q

What types of Fungicides make Leaf Spot ant Melting Out worse?

A

DMI’s and Thiophanate-methyl

19
Q

Draw the conidia of the leaf spot fungus.

A

.

20
Q

When making chemical application for summer patch control what must be done to get good control?

A

You must water in the fungicide so it gets to the roots

21
Q

What is a Syndrome?

A

A group of diseases that all have very similar effects on turf and can be controlled in similar ways

22
Q

Name a grass in which brown patch is the #1 disease.

A

Colonial Bentgrass

23
Q

How many different species of Pythium can cause disease in turf?

A

36

24
Q

Name 2 fungicides that can effectively control pythium.

A

Insignia

Segway

25
Q

What is a clamp connection?

A

It is a clamp-like structure that forms on the outside of hyphae at the septa. On basidiomycota fungi

26
Q

List 3 types of penetrant Fungicides.

A

Localized

Systemic

Acropetal

27
Q

List 3 biotic causal agents.

A

Fungi

Bacteria

Virus

28
Q

describe a snow mold fungicide program.

A

Use Iprodione and Chlorothalonil and begin spraying in early November and continue at 4 week intervals until temperature exceed 60 degrees.

29
Q

what would you do to remedy snow mold injured turf in the spring after the snow melts?

A

Rake up dead turf and clippings, Renovate the area and use resistant varieties to grow in new turf.

30
Q

What is Mycology?

A

The study of Fungi

31
Q

What characteristic of turf predisposes it to Red Thread?

A

Damaged and Infertile

32
Q

Describe a chemical control program for Summer Patch

A
  • Apply Headway fungicide
  • Begin treatments when soil stabilizes at 65 deg.
  • Use High label rates
  • Apply with 3-5 gallons of water / 100 sq. ft
  • Repeat at 28 day intervals for preventative and at 14 day intervals for curative
33
Q

describe the anthracnose cultural control program.

A
  • 3 -5 lbs Nitrogen/1000
  • Reccomended HOC
  • Topdress lightly and frequently
  • Have a Rolling program
  • Replace 80% of ET
  • Aerify
  • If using PGR, add Primo
34
Q

What is the best way to make chemical applications for Anthracnose control?

A
  • Tank mix contacts and penetrants
  • Rotate products
  • apply on 14 day intervals
  • Begin program mid-May and continue into September
  • Choose products that control other diseases at the same time
35
Q

Where and on what grasses is Gray Leaf Spot a serious problem?

A

High Cut Turf Area’s

  • Perennial Rye
  • Tall Fescue
  • St. Augustine
36
Q

Whatis the causal agent of Gray Leaf Spot?

A

Pyricularia oryzae

37
Q

How can you tell if Colletotrichum is actually killing your grass?

A

Pull the infected plant out of the ground and look for Black Stroma on the Crown or Stolons.

38
Q

list 2 environmental factors that promote dollar spot.

A

Warm Days - Cool Nights

8 - 10 hours of continual leaf wetness

39
Q

What management practice may increase Anthracnose Basal Crown Rot?

A

Low HOC

40
Q

Name the hair-like appendage in an anthracnose fruiting body.

A

Setose Acervuli

41
Q

Water soluble nitrogen sources reduce Leaf Spot and Melting Out. True or False?

A

False

Turfgrass Diseases (22 decks)

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