February, '16] GOODWIN: GRAPE berry worm 91 



Secretary A. F. Burgess: We use arsenate of lead at a strength 

 w-hich is greater than ordinarily used for orchard sprajdng, hence 

 there might be more danger in the applications of the spray which we 

 use. Early in the season 10 pounds to 100 gallons of w^ater are used 

 and the amount later is increased to 12| pounds and occasionally to 

 15 pounds if the gipsy moth caterpillars are very large and it is neces- 

 sary to kill them quickly. Emphasis should be placed on the necessitj'' 

 of keeping the spray mixture thoroughly agitated. We have en- 

 countered considerable difficulty in having the arsenate of lead prop- 

 erly mixed with water before it is placed in the tank. Mr. Worthley 

 has just de\ased k churn which can be used to thoroughly mix the 

 material. This is a matter which should be given attention if thor- 

 ough spraying is to be done. 



Mr. W. C. O'Kane: Regarding arsenic left on fruit after spraying 

 with arsenate of lead, I think I am safe in saying that you never see on 

 apples in the market enough poison to cause the death of anyone. 



Adjournment 12.00 m. 



Afternoon Session 

 Tuesday, December 28, 1915, 1.30 p. m. 



President Glenn W. Herrick: The first paper on the program 

 will be given by Mr. W. H. Goodwin. 



THE CONTROL OF THE GRAPE BERRY WORM (POLYCHROSIS 



VITEANA CLEM.) 



By W. H. Goodwin, Wooster, Ohio 



The grape-berry moth has been known in Ohio through its injuries 

 for nearly fifty years. A number of entomologists have contributed 

 to a knowledge of its life-history and habits: among them are Walsh, 

 Riley, Shngerland, Johnson and Hammar. Several others have been 

 engaged, at various times, in economic measures for berry moth con- 

 trol, but were only partially successful. Experimental work for berry 

 worm control w^as carried on in 1906 to 1909 by Professor Gossard 

 and assistants, but was finally discontinued on account of the disap- 

 pearance of the serious infestation of the' previous seasons. 



Beginning with the seasonal life-history,, the winter is passed in the 

 pupal stage. The larva spins a silken cocoon in the fall inside a fold 

 or flap cut out of a grape leaf. These leaves are usually flat on the 

 ground, or they have only one edge buried in the soil, but they are al- 

 ways soft and moist. This seems to be the proper condition of the 

 leaf to make it an attractive place where the larva can spin up for the 



