INSECTS INJURIOUS TO THE GRAPE 533 



hairs, as shown in Fig. 383. 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 July and the second generation of larva? occurs 



FIG. 384. Grape leaf showing cocoons in the making and finished by grape- 

 berry moth caterpillars natural size. (After Slingerland.) 



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 further 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. Plow- 



