REPORT OP COMMITTEE ON PUBLICATION 221 



its somewhat smaller size, and especially in the smaller size of the abdomen. 

 Individuals vary greatly." 



"Larva average length 0.35 inches. Largest on segments ten and eleven 

 tapering thence gradually to the head, and suddenly to the anus. Color 

 either dark, shiny, olive green, glaucus or brownish. Head and cervical 

 shield honey-yellow, the latter with a darker posterior margin. Piliferous 

 spots scarcely distinguishable. Described from ten specimens." 



"Chrysalis 0.18-0.20 inches long. Of normal form. Quite variable in color. 

 Usually of light honey-yellow, with a green shade on the abdomen, and black 

 eyes, but sometimes entirely dark green with light eyes. The chrysalis skin, 

 after the moth has left, is always deep honey-yellow, with the green abdomi- 

 nal mark distinct." 



The eggs are thin, semi-transparent and much flattened with a finely 

 reticulated surface and are oval in outline. Slingerland describes them as 

 "The thin, rounded, scale-like, semi-transparent eggs, measure six to eight 

 by seven to nine millimeters in size and appear whitish in a few days. 

 The shell is finely reticulated and the egg appears to be glued to the fruit by 

 some substance. The eggs look much like the codling moth's eggs, only 

 smaller." 



Life History. 



In northern Ohio, the adults of Polychrosis viteana normally emerge 

 from their winter cocoons during the first or second week in June. Winter 

 is passed in the pupal stage, in cocoons spun in a fold of the leaf the previous 

 fall, on leaves stuck in the wet soil or partially covered with mud, and are 

 seldom found in the piles of leaves or in trash into which leaves have been 

 drifted by the wind. A few days after emerging the moths lay their eggs on 

 the buds or stems of clusters of grape blossoms, or on the young grapes. 

 The larvae hatch in from four to eight days and feed on the tender stems and 

 developing berries of the grape cluster. The work of the larvae is fairly 

 conspicuous at this season of the year, as the entire cluster is often webbed 

 together by delicate white silken threads which the larvae spin around part 

 of the young grape bunch. Inside this web, the larvae devours the flower 

 buds, or young berries, of the grape, often almost destroying the young grape 

 clusters. The idea that the berry worm might have another host plant at this 

 season of the year has been suggested by the size of the brood later in the 

 season, but this is impossible as there is no other plant excepting grapes in 

 many of the worst infested localities. The injuries by the second brood of 

 the European berry moth is partially prevented by going through vineyards 

 when the first brood of worms are attacking the newly formed berries, and 

 crushing the larvae in every infested cluster of grapes. This method cannot 

 be utilized to any considerable advantage in America on account of the cost 

 of labor. The larva is full grown in from 20 to 25 days, and migrates from 

 the bunch of destroyed or injured grapes to young grape leaves, where it 

 draws the edge of the leaf over itself by silken threads attached to the sur- 

 face and edge of the leaf. This forms a fold, or tube, inside of which it 

 pupates. In from seven to ten days the pupa pushes itself almost out of the 

 cocoon, splits open at the anterior and along the back for almost half its 

 length and the moth of the second brood appears. The normal date of 

 emergence of a large part of the brood of moths is from the 6th to 12th of 



