26 



DECIDUOUS FEUIT INSECTS AND INSECTICIDES. 



DESTRUCTIVE NESS OF THE LARVA. 



As indicated under the caption dealing with the character of 

 injury, a single larva of the first brood may destroy almost an entire 

 cluster about the time the grapes are in bloom (see fig. 5). For some 

 time after blooming a larva is capable of destroying several berries 

 or even a large portion of the cluster by attacking the stem. When 

 berries are attacked after they have attained the size of a pea, how- 

 ever, rarely more than two or three are destroyed by a single larva. 

 Yet this restriction in the number of berries injured by the indi- 

 vidual larva is doubtless more than offset by the great increase in 

 the number of larvae of the second brood, which are not infrequently 



V /, 



Fig. 8.— The grape curculio (Craponius inxqualis): a, Adult, or beetle, from above; b, head, antenna, and 

 beak of same, from side; c, adult, from side; d, larva, from above; e, same, from below; /, pupa, from 

 below. All much enlarged. (From Farmers' Bulletin 284.) 



present in sufficient numbers to destroy nearly all of the berries in 

 the cluster, as is shown in Plate VI, figure 1. From these clusters 

 all the infested berries had been removed previous to taking the 

 photograph. 



OTHER INSECTS WHOSE INJURY TO GRAPE BERRIES RESEMBLES 

 THAT CAUSED BY THE LARVA OF THE GRAPE-BERRY MOTH. 



The only other insect attacking the berries of the grape whose 

 injury to the fruit closely resembles that of the grape-berry moth is 

 the grape curculio, Craponius inxqualis Say. This insect, however 

 (see fig. 8, a), is one of the snout-beetles or curculios. Its injury to 

 the grape berry is similar to that of the plum curculio upon the plum 

 and other tree fruits. The grape curculio punctures the skin of the 



