■ — 207 — 



it was entirely destro)-ed by the curculio, not a single plum being left to 

 mature. The crop in the orchard however, was immense, one-half the 

 fruit on man\- of tlie trees being artificially thinned, and then bearing so 

 much that the limbs bent to the ground and in some cases broke on ac- 

 count o( the great weight. 



Amount of Rainfall. 

 As already stated a great deal deal of rain fell during the period of 

 spraying, necessitating at least one more application than ordinarily 

 would suffice. The amount of rainfall during the period covered by 

 these experiments — jMay 15th to June 14th — is indicated in the follow- 

 table : 



Inches. 



90 



13 



02 



22 



22 



31 



trace 



trace 



09 



Conclusions. 



This series of experiments carried on through two seasons upon two 

 varieties of cherry trees and four varieties of plum trees, during which 

 a grand total of 65,500 cherries have been individually examined, seems 

 to me to confirm the conclusions provisionally announced one year a^o, 

 which may now be put in the following form : 



(i). That about three-fourths of the cherries liable to injury 

 by the plum curculio can be saved by two or three applications of Lon- 

 don purple in a water spray, in the proportion of one ounce to ten gal- 

 lons water. 



(2). That a sufficiently large proportion of the plum crop can be 

 saved by the same treatment to insure a good yield when a fair amount 

 of iVuit is " set." 



(3). That if an interval of a month or more occurs between the 

 last application and the ripening of the fruit, no danger to health need 

 be apprehended from its use. 



(4). That spraying with the arsenites is cheaper and more practical 

 than any other known method of preventing the injuries of this insect. 



INIr. Smith called attention to the f;ict that in New Jersey there was 

 no second brood of the Elm Leaf Beetle this season. Prof Ilargitt re- 

 ported that peaches were seriously injured by the curculio in south-west- 

 ern Ohio this season. 



