76 THE MONTHLY BULLETIN. 



THE LARGE ROSE APHID. 



Mactusipliuin rosw Linn. 

 (Fig. 60.) 



General Appearance. — A large aphid, being green and pink in color. 

 The apterous forms have dark cornicles and the joints of the legs and 

 antenna^ dusky, while in addition to these the thorax, entire antennie 

 and l)lotehes on the sides of the abdomen of the winged forms are dark. 

 Length, 2 to 3 mm. Readily distinguished from the other common 

 green rose aphid by the large size and pink forms. 



Life History. — Works on the young shoots and buds of the roses, 

 almost throughout the entire year. Especially troublesome in the early 

 spring during the months of April and May. Not so serious a pest on 

 roses as is the small green louse {Myzus rosarum). 



Distribution. — ^Throughout the entire State. 



Food Plants. — Roses, wild and cultivated. 



Control. — In order to save the buds it is sometimes necessary to 

 spray the bushes with a soap and tobacco spray. Washing the bushes 

 every day with a high pressure of water will keep them off and is a 

 practical method of control. 



Natural Enemies. — Natural enemies completely eliminate the attacks 

 of this ]iest by the middle of sunnner. 



RED VIOLET LOUSE. 



Rliopalosiphum violw Perg. 



General Appearance. — All forms are dark red ; the wings are notice- 

 ably clouded along the veins which easily distinguishes this species 

 from all others infesting violets. 



Life History. — Viviparous females, winged and apterous, bring forth 

 young continually throughout the early spring and summer months. 

 Evidently the entire life cycle is passed upon the violet. 



Distribution. — Throughout the entire State; works on the tender 

 shoots and undersides of the leaves. 



Food Plants. — Cultivated violets. 



Natural Enemies. — This species is usually held in perfect control by 

 internal parasites. 



BLACK CHERRY LOUSE. 



Myzus cerasi Fab. 



General Appearance. — A sliining jet black louse, congregating in 

 great numbers on the young and tender foliage. Particularly charac- 

 terized by the long swollen cornicles or honey tubes. The young greatly 

 resemble the adults, but are somewhat lighter in color. 



