90 N. S. ENTOMOLOGICAL SOCIETY. 



THE CODLING MOTH IN NOVA SCOTIA. 



By G. E. Sanders, Field Officer in Charge 

 Dominion Entomological Laboratory, Annapolis Royal, N. S. 



/^VWING to its comparative scarcity in Nova Scotian orchards, the 

 ^-^ Codling Moth has received very little attention as yet in the 

 province. It is very rare to find even an unsprayed orchard which give 

 over five per cent wormy apples, so the spray after the blossoms may be 

 retarded or advanced as the control of other insects or fungus diseases 

 may demand, with no risk of extensive damage to the apple crop 

 through failure to control codling moth. 



One very interesting bit of information in regard to the Codling 

 Moth was obtained from the experiment in R. S. Eaton's orchard in 1912 

 — 13, where it was shown that the spray applied immediately before the 

 blossoms, alone controls some 71.3 per cent of them; while the spray two 

 weeks after the blossoms alone controlled 65.6 per cent, the spray im- 

 mediately after the blossoms alone controlled 89.2 per cent, and where all 

 these sprays were applied they controlled 92.2 per cent. The infestation 

 in this orchard was very light, running 4.16 per cent wormy apples in 

 the check plots, so the liability to error was greater than if the infesta- 

 tion had been more severe. 



The experiment shows that in Nova Scotia, the life periods of the 

 Codling Moth are drawn out over an enormous period; this evidence is 

 corroborated by the findings of Siegler and Simanton, in Bull. 252 of the 

 U. S. Dept. of Agriculture in which they state that in Maine it is thirty- 

 seven days from the time the first larva emerges from the egg until the 

 last one emerges. The same authors also state that only two per cent of 

 the first brood pupate to form a second brood. Here in Nova Scotia we 

 have never found any definite indications of a second brood. 



