Fungi

Question 0

Example of chytridiomycetes?

Answer 0

Physoderma maydis - brown spot of corn
Opidium brassicae - root parasite
Urophlyctis alfalfae - crown wart of alfalfa

Question 1

Chytridiomycetes

Answer 1

Zoospores produced. Sexual stage produces thick walled sporangium.

Question 2

Causal organisms of choanephora rot (whisker rot)?

Answer 2

Choanephora pepo, choanephora cucurbitarum

Question 3

Symptoms of choanephora rot?

Answer 3

Soft watery rot with infectiom

Question 4

Signs of choanephora rot?

Answer 4

White fungal growth with rapid development of black spores. Large spore bearing structures. Easily seen with 20x

Question 5

Disease cycle of choanephora rot?

Answer 5

Overwinter in sexual stage (zygospores) - disperse by vectors - infect produce and flowers - rot - signs

Or rot - sexual process - zygospores

Question 6

Favorable conditions for choanephora rot?

Answer 6

High temp (>77) wet conditions. Rapid development (1-2 days) in summers.

Question 7

Loss from choanephora rot?

Answer 7

Produce rot

Question 8

Management of choanephora rot?

Answer 8

Very little. Sanitation, dry out - raised bed for drainage.