April, '21] 



bilsing; pecan nut case bearer 



151 



Another series of spraying experiments was tried in a pecan orchard 

 at College Station with calciiim arsenate which yielded negative results. 

 As this orchard is about one hundred miles from the Corsicana orchard 

 it is impossible to say at the present time if the difference was due to 

 differences in rainfall or to the differences between calcium arsenate and 

 arsenate of lead. It will be necessary to repeat this in order to determine 

 the exact cause. 



Plot II — Sprayed 



First Spraying May 8 Arsenate of lead 3 lbs. ; water 50 gal. 



Second Spraying .... May 22 Arsenate of lead 3 lbs. ; water 50 gal. 



Third Spraying June 26 Arsenate of lead 3 lbs.; water 50 gal. 



Plot IV — Sprayed 



First Spraying .... May 8 Arsenate of lead 3 lbs. ; water 50 gal. 



Second Spraying . . May 22 Arsenate of lead 3 lbs. ; water .50 gal. 



Third Spraying . . . June 26 Arsenate of lead 3 lbs. ; water 50 gal. 



Plot V — Sprayed 



First Spraying .... May 8 Arsenate of lead 3 lbs.; water 50 gal. 



Second Spraying . . May 22 Arsenate of lead 3 lbs. ; water 50 gal. 



Third Spraying . . . June 26 Arsenate of lead 3 lbs. ; water 50 gal. 



