SPRAYING AGAINST INSECTS 5 



as perfect beetles. There is but one brood in the 

 season. 



As the eggs of this insect are deposited beneath the 

 skin of the fruit, it is manifestly impossible to reach 

 the larvae by spraying. But by coating the young 

 fruit and foliage with particles of poison we can kill 

 many of the parent beetles before they insert the 

 eggs, and thus part of the plums will escape. This is 

 not a perfect remedy, however, except perhaps in 

 large orchards, and must often be supplemented by 

 jarring the trees. 



b 



Canker Worm 



^ e gg s >f> larva; g; pupa; a, male moth; b, female moth. (After Riley) 



Besides these two insects affecting the fruit of 

 orchard trees, against which the spraying machine is 

 especially used, there are many enemies of the foliage 

 which are open to destruction by similar means. One 

 of the worst of these pests is the Canker Worm, 

 which at more or less frequent intervals during the 

 last century has scourged both orchard and shade 

 trees in many parts of the United States and Canada. 

 It is represented in its different stages in the picture 

 above. The worm or larva hatches from masses of 

 small cylindrical eggs (e) deposited upon the bark of 

 the tree. It feeds upon the soft parts of the leaves, 

 causing a badly infested tree to appear brown and 



