Insects in the Garden S05 
To hand-pick successfully, the plants should be searched 
repeatedly, beginning as soon as signs of the insect are 
seen. 
(3) Use of poisons. Poisons are often used to kill 
chewing insects, and for some insects the use of a poison 
is the best means of control. How to mix poisons and 
"U.S. D.A. 
Fic. 175. Map showing the rapid spread of the cabbage butterfly. It first 
appeared at Quebec in 1860, and, spreading southward and westward, by 1881 it 
was found over half the continent. 
