62 



N. S. ENTOMOLOGICAL SOCIETY. 



TABLE NO. X. 



PERCENTAGE OF FALL WEB WORM LARVAE Hyphantria cunea) KILLED 



AFTER FEEDING 13 DAYS ON APPLE LEAVES SPRAYED WITH THE 



FOLLOWING COMBINATIONS OF POISONS AND FUNGICIDES. 



All larvae alive at the end of 13 days when fed unsprayed leaves. 

 All larvae alive at end of 13 days when given no food. 



In each of these tables results are shown which do not harmonize with those shown 

 in other tables. Species naturally differ in their degree of susceptibility to the poisons 

 and the same species varies at different stages in the development. Then there are in- 

 dividual differences in the larvae, some lots feeding more freely than others. A goodly 

 proportion of this variation, doubtless, comes within the range of the experimental error. 

 It would appear from these tables that the tussock moth larvae were more effected by 

 the poisons used in combination with Bordeaux mixture and by arsenate of lime than 

 some of the others. 



