Lab 8

Question 1

What do germinated teliospores produce

Answer 1

basidia and basidiospores

Question 2

sorus (pl. sori)

Answer 2

black mass of teliospores

Question 3

pathogen of the common smut of corn

Answer 3

Ustilago maydis

Question 4

how does common smut of corn reduce yields

Answer 4

forms galls on aboveground part of host

Question 5

Where are older plants affected by common smut of corn

Answer 5

axillary buds
individual flowers of ear
tassel
leaves
stalks

Question 6

What do the galls on common corn smut release

Answer 6

teliospores

Question 7

scientific name of covered smut

Answer 7

Tilletia caries
OR
tilletia laevis

Question 8

In covered smut what is the kernel replaced by

Answer 8

bunt balls full of teliospores

Question 9

Scientific name of Loose smut of wheat

Answer 9

Ustilago hordei

Question 10

in loose smut what are the teliospores initially surrounded by

Answer 10

a very thin membrane that breaks down soon after teliospore formation

Question 11

in loose smut what are the kernels replaced by

Answer 11

dry, black masses of spores

Question 12

Describe the hyphae of Rhizooctonia spp.

Answer 12

septums
constriction at junction
branching at right angles

Question 13

What is Rhizooctonia damping-off

Answer 13

poor emergence due to damping-off disease