64 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Some of the band records might even become misleading were 

 they not supplemented by observations from the rearing experi- 

 ments. For instance the great drop in the curve of the Benton 

 Harbor record (fig. 19) was due to the exposed condition of the 

 apple trees and to severe storms during the latter half of July. Owing 

 to the dropping of over half of the apple crop that resulted, a large 

 number of larvae failed to reach the bands, and many immature larvae 



25 30 5 10 15 20 25 30 5 10 15 20 25 30 5 10 15 2,0 25 30 5 10 15 20 25 30 5 10 15 

 v/ULY AUGUST SEPTEMBER OCTOBER NOV. 



Fig. 18. 



-Curves made from band-record experiments in orchards at the lake shore near Douglas, at Douglas, 

 and at New Richmond, Mich., 1911. (Original.) 



were materially delayed in their normal growth in apples on the ground. 

 There is also to be noted a marked difference in the relative abund- 

 ance of first-brood and second-brood larvae in the different localities. 

 Of the total number of larvae of the Douglas band records 50 per 

 cent were of the second brood, while of the Pentwater records only 

 31 per cent pertained to the second brood. For a comparison of 

 the details of the results for the five band records reference is made 

 to Table LXVIII. 



