GRAPE-BERRY MOTH IN NORTHERN OHIO. 



23 



number of larvae were thus removed occurred to the writer, but an 

 estimate of one-third would be conservative. This had a decided 

 influence on the number of overwintering pupae and subsequent 

 infestation in 1918. 



Table XXVI. — Percentage of cocooning previous to and during grape harvest, Sandusky, 



Ohio, 1917. 



Time. 



Date. 



Number 



of 

 cocoons. 



Percent- 

 age of 

 total. 





To Oct. 8 



1,291 

 653 



1,944 

 2,174 

 2,309 



55.91 





Oct. 8-18 



28.28 





To Oct. 18 



84.19 





To Oct. 22 



94.16 





To Nov. 10 



100.00 









SSPTCMBSP . OCrOSS/? /VOHC/fBEG 



% % S S3 % s 



or 



MOTHS 



&EPOSIT/ON 



£i.oa»m& psff/o o /-"jp /tAY 2ass ppflr 



&OCOO/V/N& 



mrp&rNCE 



Or 



rtorHS 



0£POS/r/OM 



JseSPfZAY 



CCWCOf?0 CATAWBA 



COCOOMNG 



H/BE/?NAT/a/V OF 

 FIPST BPOOO 

 PUPAE. 



Fig. 3.— Diagram shoeing summary of the life-history data for 1917 of the grape-berry moth. Solid lines 

 Indicate actual records and dotted lines indicate occurrence of stages as observed in the field and com- 

 puted from the average length of period. 



SUMMARY OF SEASONAL-HISTORY STUDIES IN 1917. 



A summary of the data presented in the preceding tables is shown 

 graphically in figure 3. 



It should be kept in mind in applying this diagram to future 

 seasons that the season of 1917 was later than the average for northern 

 Ohio and was unseasonably wet and cold throughout the fall. 



