GRAPE-BERRY MOTH IjST NORTHERN OHIO. 



The average length of the prepupal period was 4.15 days, the 

 maximum 7 days, and the minimum 3 days. 



TIME OF COCOONING OF THE SECOND-BROOD LARVJ3. 



In an effort to determine the percentage of worms normally re- 

 moved from the vineyards with the harvested grape crop the following 

 records were secured: 



Table VIII. — Time of cocooning of the second brood of the grape-berry moth at Sandushy, 



Ohio, in 1916. 



Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 

 Sept. 



8... 

 9... 



in., 

 ii.. 



12.. 



13.. 

 14.. 

 15.. 

 16.: 



17.. 

 18.. 

 19.. 



20.. 

 21.. 

 22.. 

 2?-.. 

 24.. 

 25.. 

 26.. 



Date of cocooning. 



Number 

 of co- 

 coons. 



1 

 1 



6 



3 



44 



5 



39 

 43 

 157 

 121 

 350 

 163 

 120 

 335 

 340 

 254 

 153 

 343 

 309 

 402 

 233 

 197 

 94 

 145 

 114 

 101 

 142 

 251 

 171 

 94 

 68 

 126 

 128 



Date of cocooning. 



Sept 

 Sept 

 Sept 

 Sept 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct 

 Oct 

 Oct. 

 Oct. 

 Oct 

 Oct 

 Oct 

 Oct. 

 Oct. 

 Oct 

 Oct. 

 Oct. 

 Oct. 

 Oct 

 Oct 

 Nov. 

 Nov 

 Nov 

 Nov 



.27. 

 .28. 

 .29. 

 .30. 

 I... 

 2... 

 3... 

 4... 

 5... 

 6... 



Number 

 of co- 

 coons. 



Total. 



244 



109 



46 



18 



33 



40 



64 



87 



119 



64 



51 



55 



16 



10 



15 



9 



15 



14 



9 



16 



8 



6 



5 



4 



6 



6 



6 



2 



4 



4 



6,138 



Larvae began to leave the grapes as early as August 22 and con- 

 tinued to leave as late as November 7. The table further shows 

 that 77 per cent of the larvae left the fruit previous to September 25, 

 the date of the beginning of the Concord harvest, and that 90 per cent 

 had left the grapes previous to the beginning of the Catawba harvest 

 on October 3. From these data it would seem that little control 

 is effected by the removal of the worms with the crop. 



SEASONAL-HISTORY STUDIES, 1917. 



The 1917 rearing records begin with the emergence of spring-brood 

 moths from overwintered pupae. These pupa? were kept under a leaf 

 blanket in the insectary yard, a condition similar to that in a pro- 

 tected part of the vineyard. At the time when "plowing away" 

 from the vines began in the Sandusky section May 14, the cocoons 

 were moved from the wintering place to the insectary, placed in rear- 

 ing jars, and records of moth emergence taken as shown in Table IX. 



