INSECTS INJURIOUS TO THE GRAPE 



465 



head and black thoracic shield. The body is covered with 

 numerous faintly outlined darker spots, from which arise whitish 

 hairs. The larva cuts out a piece of a leaf on three sides, folds it 

 over and fastens the free edge to the leaf with silk. The fold is 

 then lined with a thin layer of silk, making a thin cocoon in which 

 it transforms to a light greenish-brown pupa, from which the 

 moth emerges twelve to fourteen days later. The moths of the 

 second and later generations place their eggs on the berries and 

 the larvae bore into them and feed on the pulp and seeds. In 

 New York the moths of the second generation appear in early 



FIG. 388. Grape leaf showing cocoons in the making and finished by grape- 

 berry moth caterpillars natural size. (After Slingerland.) 



July and the second generation of larvae occurs during July and 

 August. In New York those larvae of the second generation 

 which mature before mid-August pupate and give rise to a third 

 generation, while those maturing later transform to pupae, but 

 hibernate. Often there is nearly a complete third brood in that 

 latitude, and farther south there are undoubtedly at least three 

 generations. The winter is passed in the pupal stage in the 

 cocoons, which break off from the fallen leaves. 



Control Infested berries should be picked off both to destroy 

 the larvae and to prevent the spreading of fungous diseases. 



