336 Gardening 
adults and larve of the beneficial lady beetles feed almost 
entirely upon aphids. One of the lady beetles, however 
(the “squash lady bug’’), eats the leaves of the squash, 
pumpkin, muskmelon, watermelon, and cucumber ; and 
another species is injurious to bean crops in Colorado, 
Arizona, New Mexico, Texas, and Mexico. These in- 
jurious lady beetles should be destroyed. They may be 
controlled by spraying with lead arsenate, in the same 
way that other chewing insects are treated. 
The gardener receives much assistance from nature 
through the feeding habits of beneficial insects and birds 
which destroy and help to keep in check the various in- 
sects that injure garden crops. But it is often necessary 
for him to take the matter of destroying insects into his 
own hands. 
Fortunately, the gardener is able to use methods that 
hold in check and destroy most of the insects injurious to 
garden crops, and through close observation he can gain 
in experience and knowledge so that as soon as insect 
enemies appear in the garden he will know just what to 
do, when to do it, and how to do it. 
Questions 
What do we need to find out about an insect before we attempt 
to control it? How can the chewing insects in general be de- 
stroyed? Describe the life history of the cabbage butterfly, 
naming the four stages or conditions in its life. In which stage 
is it injurious to cabbage plants? What are the usual methods 
of controlling the cabbage butterfly ? 
How is dry Paris green prepared for use against insects? How is 
it used ? How is Paris green prepared when used as a liquid 
spray ? How is arsenate of lead used when dry? How is it pre- 
pared -when used as a liquid spray? Describe the preparation 
