PROCEEDINGS, 1915. 



in Nova Scotia, as determined by us during the past two seasons, is nine, 

 and the minimum number, six. These figures were obtained by rearing 

 the first born young of the first born young, and the last born young of 

 the last born young respectively, through all generations. This gives 

 us an average number of 7 1-2 generations for this insect in Nova Sco- 

 tia. 



The various details in connection with the life history of the species 

 are shown in Fig. 1 and Tables 1, 2 & 3. 



Fig. 1. Generations of Aphis pomi DeG., 1915 



Injuries. The injury of this insect may involve leaves, twigs and 

 fruit, and as the insect continues breeding on the apple throughout the 

 entire season the damage done may be considerable. 



The leaves curl up as a result of the insect's attacks, much to the de- 

 triment of the crop, as in severe cases, the leaves are so badly affected 

 as to seriously interfere with the nutritive processes of the trees. 



The tender succulent twigs are likewise attacked. In exceptionally 

 severe cases such twigs may even die, or become so weakened that they 

 succumb to winter injury. Frequently also, the work of the insects paves 

 the way for wood destroying fungi. In trees with a rapid spindly growth, 

 the twigs may be curiously bent and twisted as a result of the aphid work. 



Injury to fruit is by no means uncommon in Nova Scotia, and in 

 years of severe outbursts the yield may be considerably reduced in this 

 way. Small pimples or proturberances mark the injury and the fruit may 

 be otherwise scarred and misshapen, The green aphis shows a prefer- 

 ence for succulent rapidly growing shoots. 



