340 



INJURIOUS INSECTS. 



Fig. 146. 



GKAPE BERKT-MOTH. 

 a. Pupa ; 6, Chrysalis. 



The first moths appear in Southern Illinois and Central 

 Missouri about the 1st of August, and as the worms are 

 found in the grapes during the months of August and 

 September, or even later, and as Mr. Read has kept the 

 cocoons through the greater part of the winter, there is 

 every reason to believe that a second 

 brood of worms is generated from 

 these moths, and that the second 

 brood of worms, as is the case of the 

 Codling-moth of the apple, passes 

 the winter in the cocoou, and pro- 

 duces the moth the following spring, 

 in time to lay the eggs on the 

 grapes while they are forming. 

 This worm is found in greatest numbers on such grapes 

 as the Herbemont, or those varieties which have tender 

 skins, and close, compact bunches; though it has also 

 been known to occur on almost every variety grown. As 

 already stated, there can be little doubt but that the greater 

 part of the second brood of worms passes the winter in 

 the cocoon on the fallen leaves; and, in such an event, 

 many of them may be destroyed by raking up and burn- 

 ing the leaves at any time during the winter. The ber- 

 ries attacked by the worm may easily 

 be detected, providing there is no 

 " grape rot " in the vineyard, either by 

 a discolored spot as shown at figure 145, 

 c, or by the entire discoloi'ation and 

 shrinking of the berry, as is shown at 

 figure 145, d. When the vineyard is attacked by the 

 "rot," the wormy berries are not so easily distinguished, 

 as they bear a close resemblance to the rotting ones. All 

 fallen berries should be picked up and destroyed. 



Fig. 147. — CHTSAI.IS. 



