8 NEW YORK STATE MUSEUM 



those of earlier years, the very great benefits which can be derived 

 from the first or so-called calyx spray, and indicate most strongly 

 the necessity of thoroughness if satisfactory results are to be 

 obtained. The work in the orchard of Mr H. E. Wellman, Ken- 

 dall, when compared with that of the preceding year, shows -a 

 very gratifying reduction in infestation. The same plots were 

 used and the wormy apples of the past season were from one-third 

 to two-thirds less than those of 191 5. A careful study of the dif- 

 ferent types of codling moth injury have enabled us to verify 

 earlier opinions as to the relation existing between them and the 

 habits of the insect, and also to outline rules for determining the 

 period during which different injuries may be inflicted, something 

 of considerable importance in connection with the enforcement 

 of the apple grading and packing law. We have also, through 

 the cooperation of several local observers, secured detailed tabula- 

 tions of evening temperatures and other meteorological data under 

 orchard conditions. Unfortunately the egg laying of the moth 

 was so distributed the past season that it was impossible to demon- 

 strate a well-marked relation between evening temperatures and 

 the deposition of eggs, though it is probable that such exists. The 

 meteorological data recorded constitute a substantial basis for 

 subsequent investigations. The work with this insect developed 

 serious and somewhat general injury to Baldwin foliage in particular, 

 due probably to the application of a rather strong fungicide imme- 

 diately after a series of rains which produced an unusually tender 

 growth. The details of this work are discussed on the following 

 pages. 



Apple maggot. Owing to the continued injuries by this pest an 

 investigation of the insect, with special reference to practical 

 control measures, was started and through the cooperation of Mr 

 Edward Van Alstyne of Kinderhook, and Mr George T. Powell 

 of Ghent, a test of sweetened poisons for the destruction of the 

 adults was conducted.- The results were so equivocal that we are 

 unable to recommend this spray and for the present are contenting 

 ourselves with advising the early destruction of infested fruit, 

 supplemented by good orchard practice. The investigations of the 

 past season demonstrated such variations in the habits of the 

 insect in nearby orchards that a continuance of this study is planned 

 for another year. 



Leaf roller. Investigations in connection with the codling moth 

 work showed this serious pest of the fruit grower in the western 

 part of the State to be much less abundant than was the case in 



