INSECTS AND PLANT DISEASES 



77 



their eggs, where they lay them, when the eggs hatch, 

 and the like. 



Parts of an Insect. Insects are so called because 

 they are "in sections." They have a head provided 

 with a pair of feelers, a pair of strong jaws or a suck- 

 ing tube, a body to which are attached three pairs of 

 legs, usually two pairs of wings, and an abdomen. 

 The abdomen is the back portion of the body made up 

 of several ring-like sections and capable of holding a 

 large amount of food. They breathe through little 

 holes in their sides. 



THE FOUR STAGES OF INSECT GROWTH. 



Eggs on leaf, caterpillar, chrysalis or resting stage, full grown 

 insect. 



The Life of an Insect. There are ordinarily four 

 stages of insect growth the egg stage, the "grub" or 

 caterpillar stage, the resting stage and the full grown 

 insect. The egg is laid by a full-grown insect in the 

 ground, on the leaves of plants, in rotten wood, on the 

 bark of trees, or even in the blossoms of plants, or in 

 fruits. This egg hatches into what we usually call a 



