206 PESTS OF GARDEN AND FIELD CROPS 
plants will die. Cucumbers and tomatoes usually are badly infested, 
but almost any vegetables or flowering plants grown in greenhouses 
may be attacked. 
The most effective remedy is fumigation with hydrocyanic acid gas. 
Some benefit will be derived from spraying with whale-oil soap, 13 
ounces to 1 gallon of water. 
Mealy Bugs 
Slow-moving, oval, soft-bodied bugs, one tenth to one sixth of an 
inch long, the body covered with a whitish, powdery secretion, infest 
various plants grown under glass. In the South they are a nuisance 
Fic. 255.— Mealy Bugs on melon. Original. 
on citrus fruits. The Citrus Mealy Bug, Pseudococcus citri Risso, and 
a closely related form, Pseudococcus longispinus Targ., are common 
species. 
The young are small, red, and fairly active at first. The adult males 
are winged. 
Contact insecticides, especially such as contain soap or oil, are effec- 
tive remedies. They should be applied with considerable force in 
order to penetrate the waxy powder with which the bodies of the 
insects are coated. 
