9. Which fumigant is currently used for the control of pests of stored food products?
a.
Diethyl toluamide.
b.
Aluminum phosphide.
c.
Aluminum chlorhydrate.
d.
None of the above.
10. Chemicals which kill certain kinds of plants while not seriously injuring others are
known as _____________________ herbicides.
a.
Choosy.
b.
Discriminating.
c.
Selective.
d.
Picky.
11. Match the following:
Characteristics:
Types of Herbicides:
a.
Preemergence
_____
(1)
Act like hormones.
b.
Growth regulator
______
(2)
Enter through respiratory system.
c.
Soil sterilant ______
(3)
Make soil unable to support life.
d.
Contact
______
(4)
Require repeated treatment.
(5)
Kill tissues wetted with spray.
(6)
Applied before foliage appears.
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MD0173
1-19