April, '12] QLAINTANCE: CODLING MOTH 163 



for the codling moth, though orchardists shoukl be made fully ac- 

 quainted, for adoption or not, with the results following one thorough 

 application. 



Doctor Felt presents data on another question, concerning which 

 there has been more or less uncertainty, namely, the value of the 

 treatment given three or four weeks after the falling of the petals and 

 when the codling moth larvse are hatching in maximum numbers. 

 Sanderson, who gave considerable attention to this point (I.e.), con- 

 cluded as the result of his tests that as regards the value of the third 

 spraying (2nd) the only conclusion possible is that if no rains occur 

 after Spray I, that application of Spray III will be of doubtful value 

 when unsprayed trees show not over 50% worminess for the season. 

 This treatment, it will be noted, is considered in connection with the 

 first treatment, and Doctor Felt's conclusions, and our own, agree 

 fully with those of Professor Sanderson. When the first spraying 

 has been omitted or imperfectly made, a second application shows 

 to much better advantage, though it does not by any means overcome 

 the worminess due to missing the first treatment. In Doctor Felt's 

 tests to determine the value of this application alone, his final average 

 of sound fruit for three seasons is 77.47 as compared with his final 

 average of 68.78 of sound fruit from the untreated plats. There is 

 here a difference in favor of a single application of about 10 per cent. 

 According to Professor Gossard, this single treatment gave a percentage 

 of sound fruit of 61.50, as compared with 45.80 per cent sound fruit 

 on unsprayed trees, representing a saving of 15.70 per cent of the crop. 

 The influence of still later treatments as against the second brood is 

 comparable to that just cited, and their value varies in proportion to 

 the thoroughness with which the first application was made. Its 

 effect is largely against the young larvae before they have entered the 

 fruit, although as shown, by Lloyd, a good many larvae may succumb 

 to the effect of poison sprayed on the fruit, after they have actually 

 bored beneath the skin. Doctor Felt's conclusions Beem amply justi- 

 fied from the data presented and his conservatism in still recommending 

 the usual three treatments for the territory considered by him is 

 commendable. 



President F. L. Washburn: We Avould be very glad to hear from 

 some one else. We ought not to limit discussion of this codling moth 

 question. 



T. J. Headlee: I have been tremendously interested in the paper 

 and in the remarks that have followed it. We have completed two 

 years of tests, comparing the mist with the clash spray. In the course 

 of our work, we saw that the nozzle which Mr. Ball showed was too 



