Agriculture Reference
In-Depth Information
Fig ure 3.1 9
S hi pworm s are mar ine mol lusks whi ch cau se ext ensiv e dam-
age by boring into wood (EPA,
Applying Pesticides Correctly: A Guide for
Private and Commercial Applicators,
1983).
C.
PHOLADS
Pholads are another species of marine mollusks which attack and destroy
submerged wood. Pholads look like small clams and remain enclosed in a
shell even as adults. Like shipworms, they burrow within the wood. After
boring a small (
1/8
-inch) entrance hole, they enlarge their burrow to accom-
modate the growth of their bodies. Pholads are of economic importance
mainly along the Gulf Coast and in Hawaiian waters.
D.
CONTROLLING MOLLUSKS
Mollusk pests on land (usually snails and slugs) can be controlled by
many of the same techniques that are used to control insects outdoors. Effec-
tive techniques include:
•
cultural practices—especially cultivation and trap crops
•
mechanical controls—especially traps and barriers
•
sanitation—especially eliminating crop debris and other sources of
moisture
•
chemicals—many insecticide formulations also control mollusks. In
addition, specific molluscicides are available, usually as baits.
