The Apple. 



49 



of apple trees in May or June, from which the numerous cat- 

 erpillars sally to forage on the neighboring foliage (Fig. 10). 

 The nests should be destroyed before fully formed by rub- 

 bing them off in the morning or evening with a pole, bear- 

 .^ _ ing at the end a 



swab of cloth wet 

 with kerosene to 

 kill the young 

 caterpillars. The 

 rather conspicu- 

 ous ^gg clusters 

 (Fig. 11), which 

 are deposited on 

 the young limbs, 

 may be destroyed 

 while the trees 

 are leafless. 



53. Plant lice 

 (Aphidae). These 

 troublesome in- 

 sects injure the 

 foliage of the ap- 

 ple and of nearly 

 all other fruit 

 trees by sucking 

 the juices from 

 the leaves. They chiefl}'' infest the lower side of the leaves 

 and are most troublesome in early summer. It is difficult 

 to apply an insecticide to the lower surface of the leaves, 

 and the insects being more or less protected by the curling 

 of the leaves about them, are not easily controlled after the 

 foliage has fully expanded. The buds should be examined 



FiQ. 10. Tent caterpillar. A, side view; b, back 

 view; c, egg cluster with gummy covering removed; 

 d, cocoon. (After Saundeis.) 



