GRAPE INSECTS 



431 



The grape-berry moth always passes the winter in the pupa 



(Fig. 367) state in the cocoon. In the autumn most of the 



cocoons are found 



on the damp and 



decayed leaves close 



to the ground under 



the vines rather 



than on the dried 



leaves, which are 



often blown into 



piles, and some of 



the cocoons may 



l)reak away from 



the leaves to which 



they are attached. 



The moths emerge 



about June 1 in 



New York and 



deposit their thin, 



rounded, scale-like semitransparent eggs probably on the stems 



of the blossom clusters. Some of the caterpillars hatch and 



begin feeding before 

 the grape blossoms 

 open. They make 

 a slight web among 

 the blossom buds 

 into which they cat, 

 oftentimes destroy- 

 ing a dozen or m^ore 

 embryo grape-ber- 

 ries. The destruc- 

 tive work of this 



spring brood of caterpillars continues in June through the 



blossoming period and among the recently-set berries. One 



Fig. 368. — Grape-berry moth pupa in its cocoon on 

 flap of leaf. Enlarged. 



Fig. 369. — The grape-berry moth (x 5). 



