94 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. O' 



larva3 are very active and often wriggle out of the grape bunch in their 

 attempts to escape, spinning clown on a silken thread unless they are 

 violently disturbed. In the vineyard, these larvae always spin up on 

 the young and tender leaves of the growing grape cane. The older 

 leaves seem to be too thick and harsh and in some way unsuitable for 

 the forming of a cocoon near their edges. The cocoon is usually made 

 on the edge of the thin, soft, rapidly growing leaf. In a few days the 

 growth of the leaf will tear the tissue along the edge of the cocoon, 

 and a few of these cocoons fall to the ground, but the larger part hang 

 to the grape leaf by a mere shred of leaf tissue. The late individuals 

 of this first brood of larvae cause the rapidly growing grape berries to 

 split open when the small larva destroys the pulp cells just below the 

 skin of the berry. The tissue above, being cut off from a supply of 

 nourishment, cannot grow or expand. The remainder of the berry 

 continues to grow and the berry bursts open; sometimes it gets red on 

 the edges of the break. The larvae of the August brood rarely cause 

 any bursting open of the berries. The grape berries are growing more 

 slowly at this time and the purple spot on the side of the berrj^ is the 

 first visible sign of injury. 



The opalescent eggs of the berry moth hatch in five to eight days and 

 the larvae develop rapidly in the young clusters of growing berries. 

 Usually the earlier individuals web part of a bunch of berries together 

 and often destroy almost half of the small cluster of grapes. Berry 

 worms of this brood brought to Wooster from Euclid and Dover, 

 Ohio, transformed to pupae about the 20th to 30th of July in 1913 and 

 1914, but did not transform until the 1st to 7th of August in 1915. 

 Larvae collected from around Wooster, fifty miles further south than 

 Euclid or Dover, transformed into pupae almost a week earlier and the 

 moths appeared from the 27th of July to the 2d of August in both 

 1913 and 1914. The main part of the brood of moths from the region 

 of Lake Erie did not appear until the 5th to the 10th of August in 1913 

 and 1914, but were much later in 1915, the bulk of the brood coming 

 August 11 to 17. In 1908, the moths of this brood were bred from 

 material brought from East Cleveland and the greater part of them 

 emerged during the latter part of July, ranging from the 29th to the 

 4th of August. From a scanty amount of Wooster material collected 

 in July, 1909^ moths appeared July 26 to 29, only a small numl)er of 

 moths emerging from the breeding material. The moths, emerging 

 in the fore part of August, commence laying eggs in 3 to 5 days and 

 continue to deposit their semi-transparent, slightly oval eggs for 

 about 7 to 11 days. The eggs are normally glued to the sides of the 

 berries, but they are often placed at the base of the berry stem just 



