REPORT OF THE STATE ENTOMOLOGIST I912 I3 



INJURIOUS INSECTS 



CODLING MOTH 

 Carpocapsa pomonella Linn. 



Practical field work with the codling moth was continued the 

 past season and the results of the previous three years of work 

 very satisfactorily confirmed. The spraying of 19 12 was confined to 

 young and moderate sized Ben Davis trees on the farm of Thomas 

 Albright, New Baltimore. A power sprayer was used and an effort 

 made to do thorough work, yet the applications were by no means 

 excessive. A check or unsprayed tree produced only 38.95 per cent 

 of sound fruit, while those in the immediate vicinity and sprayed 

 as described above, yielded from 97.53 to 99.53 per cent, or an aver- 

 age of 98.69 per cent, of worm-free apples. The other plot similarly 

 treated comprised larger trees and produced from 95.17 to 98.77 

 per cent, or an average of 97.26 per cent, of sound fruit. Consid- 

 ering that this spraying was done under adverse conditions and the 

 yield of individual trees by no means excessive, the results are all 

 that could be expected. These returns were checked by examina- 

 tions of the yields from representative trees in the orchards of 

 W. H. Hart, Poughkeepsie, and of Edward Van Alstyne, Kinder- 

 hook. These trees were sprayed last spring in the ordinary practi- 

 cal manner and with no expectation that any of the trees would 

 later be selected for test purposes. In the orchard of Mr Hart, his 

 northern spy trees produced from 97.87 to 98.77 per cent, or an 

 average of 98.23 per cent, of sound fruit. Mr Van Alstyne's trees, 

 composed of Baldwins and greenings, yielded from 95.12 to 97.50 

 per cent, or an average of 96.20 per cent, of worm free apples. 

 None of these trees were sprayed more than once during the season 

 with a poison, and the applications were made within the week or 

 ten days necessary to secure the best results. It should be recalled, 

 in this connection, that our earlier work has shown that sprayings 

 made about three weeks after the blossoms fall are only about one- 

 half as effective as the applications after the dropping of the blos- 

 soms and before the calyx cup is closed. 



