2 BULLETIN 911, U. S. DEPARTMENT OF AGBICULTURE. 



in these leaves. The leaves bearing cocoons were removed each day 

 and fresh ones supplied. The cocoons were placed in small jelly 

 glasses until the moths emerged. The moths were removed each 

 day as the records were taken. To secure oviposition records when 

 the moths are confined several different methods have been tried 

 but all without satisfactory results. 



Throughout this work the rearing records have been checked and 

 supplemented by extensive field observations and, except where 

 noted, represent as nearly the actual conditions as it was possible to 

 approximate. Each table presented is to be considered complete in 

 itself and not dependent on any other table. Special methods for 

 the securing of any particular records are given with the records. 



WEATHER CONDITIONS IN 1916, 1917, AND 1918. 



Seasonal-history data sufficient for accurate timing of spray 

 applications were secured in 1916 and the other data secured were 

 incidental. The weather conditions in the season of 1916 were 

 about normal except for an unusually warm dry autumn. In 1917 

 the records ajre more complete, but represent an abnormally late and 

 wet season throughout. The fall was unusually cold and rainy and 

 considerably retarded the development of the second-brood larva?. 

 In 1918 berry-moth infestation was generally light throughout 

 northern Ohio and difficulty was experienced early in the season in 

 securing sufficient material for rearing records. The season of 1918 

 opened unseasonably early and remained advanced throughout. 



SEASONAL-HISTORY STUDEES, 1916. 



These studies began with the collection of early hatching first- 

 brood larva? in the vineyards. Vineyards known to have been 

 heavily infested in 1915 were searched carefully on June 1, 5, 10, 

 and 14, but not until June 20 was a larva found. At this time only 

 an occasional larva could be found and there was no general infesta- 

 tion of the grape cluster buds. Not until July 5 were larva? present 

 in the vineyards in any considerable number. Collections of larva? 

 were made frequently and regularly throughout the season, beginning 

 June 20. 



FIRST GENERATION. 



TIME OF FIRST-BROOD LARV^l LEAVING THE FRUIT. 



Actual records began with the early hatching larva? leaving the 

 fruit. Table I shows the dates on which the first-brood larva? spmi 

 their cocoons. The earliest date is seen to be June 28 and the latest 

 August 18, with the greatest number cocooning on July 21. It 

 seems worthy of note that a very large percentage, 81.35 per cent, 

 cocooned within the 12-day period from July 16 to July 27, inclusive. 



