INSECTS, DISEASES, AND CONTROL 277 



They are protected by the plants which they are injuring. 



Codling-moth is controlled by the application of poison 

 just before the young larva enters the apple or other fruit. 

 The worm-like larva eats its way into the fruit. If poison is 

 present at that time, the insect will be destroyed. 



Plum Curculio attacks plums, peaches, cherries and occa- 

 sionally other fruits. The egg is laid in a small cut in the 

 skin of the fruit when very small. When the latva hatches it 



Fia. 138. — Sound fruit produced by syetematic spraying. (TJew Jersey Station.) 



eats its way toward the center. Poison applied just before the 

 eggs are hatched will kill large numbers of larvse, but this is 

 not a perfect remedy. The adult insects before laying their 

 eggs are often shaken to the ground and caught on sheets 

 under the trees. This is best done in the very early morning. 

 If this process is repeated for several mornings, just before or 

 about the time the petals fall, numerous adult insects can be 

 destroyed. 



