Final - Section 4

Question 1

What is a common sign for brown patch on bentgrass?

Answer 1

Smoke Ring of hyphae

Question 2

When is Yellow Patch active?

Answer 2

Cool Weather

45 - 65 degrees

Question 3

What characteristic is unique for Pythium mycelium?

Answer 3

It is aseptate

Question 4

What time of year can Pythium cause disease in turf?

Answer 4

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.

Question 5

Name two fungicides that will NOT control Pythium.

Answer 5

Azoxystrobin

Pyraclostrobin

Question 6

How does Nitrogen affect snow molds?

Answer 6

Excess nitrogen makes the turf more susceptible to disease

Question 7

What management practice may increase Basal Crown Rot?

Answer 7

Short HOC

Question 8

Name the Favored host for Anthracnose.

Answer 8

Poa annua

Question 9

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

Answer 9

Excess nitrogen makes the plant more susceptible to disease

Question 10

What environmental condition increases Gray Leaf Spot?

Answer 10

ALternating period of weat and dry in the heat

Question 11

Draw the conidia of the leaf spot fungus.

Answer 11

.

Question 12

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

Answer 12

Mow at reccomended cutting heights

Question 13

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

Answer 13

Avoid Nitrate nitrogen sources

Question 14

What turf is the common host for Take-All.

Answer 14

.Agrostis spp.

Question 15

What two fungicides are effective against water molds?

Answer 15

Heritage

Segway

Question 16

Name two diseases that have Smoke Ring symptoms.

Answer 16

Rhizoctonia solani

Waitea circinata

Question 17

Name the piercing mouthpart of a nematode.

Answer 17

stylet

Question 18

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

Answer 18

DMI’s and Thiophanate-methyl

Question 19

Draw the conidia of the leaf spot fungus.

Answer 19

.

Question 20

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

Answer 20

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

Question 21

What is a Syndrome?

Answer 21

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

Question 22

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

Answer 22

Colonial Bentgrass

Question 23

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

Answer 23

36

Question 24

Name 2 fungicides that can effectively control pythium.

Answer 24

Insignia

Segway

Question 25

What is a clamp connection?

Answer 25

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

Question 26

List 3 types of penetrant Fungicides.

Answer 26

Localized Systemic Acropetal

Question 27

List 3 biotic causal agents.

Answer 27

Fungi Bacteria Virus

Question 28

describe a snow mold fungicide program.

Answer 28

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

Question 29

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

Answer 29

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

Question 30

What is Mycology?

Answer 30

The study of Fungi

Question 31

What characteristic of turf predisposes it to Red Thread?

Answer 31

Damaged and Infertile

Question 32

Describe a chemical control program for Summer Patch

Answer 32

* 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

Question 33

describe the anthracnose cultural control program.

Answer 33

* 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

Question 34

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

Answer 34

* 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

Question 35

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

Answer 35

High Cut Turf Area's * Perennial Rye * Tall Fescue * St. Augustine

Question 36

Whatis the causal agent of Gray Leaf Spot?

Answer 36

Pyricularia oryzae

Question 37

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

Answer 37

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

Question 38

list 2 environmental factors that promote dollar spot.

Answer 38

Warm Days - Cool Nights 8 - 10 hours of continual leaf wetness

Question 39

What management practice may increase Anthracnose Basal Crown Rot?

Answer 39

Low HOC

Question 40

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

Answer 40

Setose Acervuli

Question 41

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

Answer 41

False