Chapter 6 - Soil Fumigation

Question 1

Fumigants are different from other chemical formulations because they are _____.

a. volatile
b. all liquid formulations
c. pure active ingredient with no inerts
d. solids, liquids and compressed gasses that only work as gasses

Answer 1

d. solids, liquids and compressed gasses that only work as gasses.

Question 2

Soil fumigants control only pests present at the time of fumigation.
true or false

Answer 2

true

Question 3

Soil fumigants have residual control activity.

true or false

Answer 3

false

Question 4

What time of year is soil fumigation most effective?

a. spring
b. early summer
c. fall
d. late summer

Answer 4

c. fall

Question 5

Which is not a factor in effective soil fumigation?

a. phytotoxicity
b. soil temperature
c. soil moisture
d. soil texture

Answer 5

a. phytotoxicity

Question 6

Which type of soil has the most adsorption sites?

a. sand
b. fine textured clay
c. sandy loam
d. coarse textured gravelly soil

Answer 6

b.fine textured clay

Question 7

What is the major reason for fumigation failure?

a. improper soil preparation
b. compact soil
c. improper sealing
d. fertilizer application before fumigation

Answer 7

a. improper soil preparation

Question 8

At what soil moisture conditions do most soil fumigations occur?

a. 75-100 percent field capacity
b. 25-50 percent field capacity
c. 0-25 percent field capacity
d. 50-75 percent field capacity

Answer 8

d. 50-75 percent field capacity

Question 9

What soil temperature range is best for fumigant volatilization?

a. 45-80 degrees F
b. 40-80 degrees F
c. 30-60 degrees F
d. 2-16 degrees F

Answer 9

a. 45-80 degrees F

Question 10

What is the consequence of soils that are too wet on fumigation?

a. break down fummigant
b. inhibit extensive diffusion
c. phytotoxicity
d. lack of residual soil activity

Answer 10

b. Inhibit extensive diffusion