REPORT OF THE SOCIETY 27 



Unfortunately no very extensive rearing experiments were carried 

 on with this species. The stem mothers continued to produce young till 

 the first of June, the maximum number produced by a single individual 

 being 75. Many of the second generation acquire wings and have been 

 frequently seen flying, apparently to their summer food plants. The first 

 of this generation reached maturity on May 11. The second generation 

 continued to produce young on apple till the middle of June and so far as 

 I could determine all of them became winged and departed to their summer 

 food plants. In my work many of the second generation and all of the third 

 generation left the apple. Few are rarely seen after the first or second 

 week in June. 



The summer life-history of this species is fairly well known. Generation 

 after generation of winged and wingless females is produced on the various 

 grains and grasses throughout the summer and winged females return in 

 the fall, in September and October, to the apple. Here true oviparous 

 females are produced and winged males arrive to mate with them. The 

 eggs are then deposited for the next year's generations. 



The injury produced by this species to the apple appears to have been 

 particularly negligible during the past two years. Whether it ever has 

 done any considerable damage seems to me very doubtful, the injury 

 undoubtedly being due to the other two species. When abundant it may 

 almost completely cover every bud, as many as 70 to 80 being present on 

 each bud. However the leaves open rapidly and they do not seem to cause 

 any curling or distortion. In general it may be said that this species may 

 be considered as not a serious pest. 



The Rosy Apple Aphis 



(Aphis sorbi Kalt.) 



The rosy apple aphis has been a serious pest in American orchards for 

 many years but it has been so confused with the other two species 

 that even yet it is difficult to be certain as to which species a writer 

 is referring. Furthermore it passes under several common names as rosy 

 aphis, purple aphis, brown aphis, and others. Although described by Fitch 

 in 1854 no definite account of its life-history appeared in American liter- 

 ature till that of Sanderson in 1901 and 1902. At the present time we know 

 that this plant louse is widely distributed in the United States and Canada 

 and probably occurs wherever the apple is grown commercially. 



