April, '12] BALL; DRIVING SPRAY 153 



This is one of the highest records of efficiency ever published and 

 under the wormiest conditions in which a brood separation has ever 

 been made. To my brother, Mr. W. M. Ball, who had charge of 

 this work, must be given the credit of this record. 



The second three divisions show combinations in which the first 

 spray was omitted. A glance is sufficient to show the striking differ- 

 ence in the number of worms and efficiency. 



A comparison of the first spray only (1-0-0) with the second only 

 (0-1-0) gives a fair estimate of the relative importance of these two 

 sprays. The orchards are everywhere arranged in the order in which 

 they were sprayed. The second spray was a little too late for the 

 best effect on the later sprayed orchards, as some of the calyx cups 

 had entirely closed. A comparison of the three orchards show? a 

 steadily decreasing efficiency as the calyx cups closed. 



The second spray is never used alone. Its place is supplementary 

 to the first one where conditions are bad enough to warrant it. It 

 will be observed that the 1-0-1 spray was slightly better in the first 

 brood than the 1-1-0, but that in protecting the calyx in the second 

 brood, the reverse was true, while the side wormy would be taken care 

 of by late sprays. 



These orchards, with the exception of experimental trees, received 

 two early sprays and two late ones. The late sprays materially re- 

 duced the number of side worms in the second brood. 



Efficiency of the 2| lb. L. A. Spray. The table of the 2^ lb. L. A. 

 Spray is almost a repetition of the 5 lb. one, with the number of worms 

 everywhere slightly increased and the efficiency correspondingly 

 lowered. The change is small in the first brood but becomes much 

 larger in the second, where it equals 10 to 20 %. This confirms previous 

 experiments showing that under wormy conditions 4 lbs. of lead arsen- 

 ate is the least that should be used. 



President F. L. Washburn: The next paper will be read by E. P. 

 Felt, of Albany, N. Y., on "Recent Experiments with the Codling 

 Moth," and at its close both papers on this insect will be discussed. 



RECENT EXPERIMENTS WITH THE CODLING MOTH 



By E. P. Felt, Albany, N. Y. 



The experiments detailed below are a continuation of a series begun 

 in 1909 in an effort to test the actual value of the various methods of 

 spraying, so far as Hudson valley conditions are concerned. The 

 usual practice of orchardists was followed, the aim being to cover the 



