Peoceedings of Sevexteentii ISToRMAL Institute 2r)l 



INJURIOUS INSECTS 

 Dr. E. p. Felt 



codling moth and side injury 



Studies of tlie codling moth in cooperation with the Bureaus 

 of Farmers' Institutes and of Horticulture of the State Depart- 

 ment of Agriculture, and the Monroe County Farm Bureau, have 

 shown serious " side injury " during the last few years in the 

 apple belt from Eochester westward. In some instances 20 per 

 cent or more of the yield bore the small and characteristic blem- 

 ish produced by larvae hatching from late-deposited eggs of the 

 first brood. The pests enter the side of the apple usually the lat- 

 ter part of June or during the first half of July, eat a shallow 

 circular gallery with a radius of about one-sixteenth of an inch ; 

 and then, in large measure, desert the place of initial injury and 

 migrate to the blossom end where they frequently succumb to the 

 poison applied just after blossoming. This type of injury is 

 much less common in the Hudson Valley and appears to be most 

 prevalent near the shore of Lake Ontario. 



Experiments in three counties — Niagara, Orleans and Mon- 

 roe — show an average reduction of wormy apples in three 

 orchards, resulting from a- second spray for the codling moth, of 

 but 1.29 per cent, for the third of only 6 per cent, or for the two 

 additional sprays, of less than 2 per cent. These figures compare 

 very closelv with those obtained in the Hudson Valley and 

 strongly confirm our earlier conclusions relative to the great value 

 of the application just after the blossoms drop, for the control of 

 the codling moth. 



In all fairness it should be added that the results obtained in 

 the Niagara and Orleans county orchards were not entirely satis- 

 factory so far as the percefitage of wormy apples is concerned, this 

 ranging for plots, in the case of the former, from 13 to 1-i per 

 cent, and for the latter from 27 to 3-1 per cent on the sprayed 

 trees, and on the checks from 67 to G9 per cent. By far the 

 greater portion of this infestation, 9 to 12 per cent in one case 

 and 25 to 33 in the other, was due to " side injury." The ex- 

 planation of this condition is found in the fact that the " side 



