70 



N.S. ENTOMOLOGICAL SOCIETY. 



EFFECT OF CHEMICALS ON PUPAE. 



It will be noted that from the soil treated with Vaporite, Clifts Manur- 

 ial Insectici deand Kerosene Emulsion, no flies emerged, and only a few 

 survived the Apterite and Crysphen. Unfortunately, however, the em- 

 ergence from the check cages, those that were not treated, is not constant, 

 and there is nothing very definite to compare with. The other substances 

 had a more or less deterrant effect but they are far from being satisfac- 

 tory. 



Control measures of this type would probably be quite expensive, 

 as the fumigants and liquids used in the cages, were of a greater strength 

 than could be economically used in an orchard. However, they are worth 

 testing again. 



Spraying. 



The efficiency of the sweetened poison spray was tested this past sum- 

 mer, two orchards being sprayed near Digby and three at Windsor. Suit- 

 able orchards were left unsprayed in each locality to act as checks, in ad- 

 dition to the sprayed orchards. But in the table showing our results only 

 the 1915 infestation (in sprayed and check orchards) is taken into account. 



