212 MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



July 7, 1915. Specimens of Macrosiphum solanifolii were 

 collected from- about the flower buds of Japanese rose on the 

 campus (72-15). - 



- 72-15 (a) July 7, mature apterous viviparous females col- 

 lected from Japanese rose were placed on p6tato in the labora- 

 tory. Both the pink and the green varieties were used. These 

 settled at once. July 13, — pink and green individuals both still 

 feeding, and a vigorous colony of green nymphs present. July 

 20. Progeny of 72-15 (a) present in colonies of pink and green 

 young. 



^ 72-15 (bj July 7, — a few alate viviparous females collected 

 from Japanese rose were placed on potato plants in the labora- 

 tory. Both the pink and the green variety used. July 9, — one 

 pink female with 4 pink young, one green female with several 

 green young. July 13, — pink and green females still feeding, 

 and pink and green nymphs numerous. July 19, — plant sickly 

 but aphid colonies thriving. Nine mature apterous pink females 

 (.progeny of the alate forms of July 7 (72-15 (b) ) removed 

 to fresh potato plant under number of 72-i5>(b) (b). 



72-15 (b) (b) July 19, — 9 mature apterous pink daughters 

 of alates (collection 72-15 (b) ) placed on fresh potato plant. 

 August 2, — the progeny of aforesaid 9 individuals now number 

 approximately 500. All- are pink, 35 of these have attained their 

 growth, 20 being winged and 15 apterous. 



^ ^ * * * 



. The descendants unto several generations, of 72-15 which 

 had been collected from Japanese rose, were kept on a suc- 

 cession of fresh potato plants in the laboratory until about the 

 middle of August, when both the winged and wingless aphids 

 began to get restless. The infested plants were taken down to 

 the insect greenhouse and left uncovered. Stems of cut Japa- 

 nese rose were kept near them in jars of water. 



On September 15, these potato plants still had numerous 

 aphids upon them but many had left and established thriving 

 colonies of progeny upon the rose cuttings ; goosefoot, Chenopo- 

 dium albitin; redroot pig^veed, Amaranthus retroflexus; shep- 

 herd's purse, CapseUa Bnrsa-pastoris; several varieties of culti- 

 vated asters; and sow thistle, Sonchiis oleraceoiis. 



Both winged and wingless viviparous mature females of both 

 the green and pink color varieties were found feeding upon all 



