Quiz 2 - Brown Patch Diseases

Question 1

Causal Agent of Brown Patch

Answer 1

Rhizoctonia solani

Question 2

Causal Agent of Yellow Patch

Answer 2

Rhizoctonia celealis

Question 3

What type of fruiting body does the causal agent of brown patch produce?

Answer 3

Basidia

Question 4

What are the signs of Rhizoctonia diseases? describe them

Answer 4

Mycelium has right angle branching, pinched at branching and septa near cranching.
Produces sclerotia and basida w/ basidiaspores

Question 5

Symptoms

Answer 5

Blighted turf in rings or patches that coalesce.

Irregularly shaped leaf lesions that are tan with a reddish-brown border

Question 6

How does this fungus survive unfavorable conditions?

Answer 6

Produces sclerotia that survive in the thatch

Question 7

What are predisposing conditions?

Answer 7

Saturated soil, extended leaf wetness, stressed out plants, over stimulated plants (too much N or not enough N) Abundance of Thatch

Question 8

What phylum do Fairy Ring belong in?

Answer 8

Basidiomycota

Question 9

What is the identification of the causal agent based on?

Answer 9

The charecteristics of the Mature basidocarp and basidospores.

Question 10

Signs for Fairy Ring

Answer 10

subsurface mycelial mat
muchrooms
hyphae with clamp connections

Question 11

What is the microscope called that we use in class?

Answer 11

compound light microscope

Question 12

what are the options for magnification for the objective lenses?

Answer 12

4x, 10x, 40x and 100x