

CATALOGUE OF INSECTS. 103 



RHOPALOSIPHTJM Koch. 



R. berberidis Fitch. Plant louse on barberry. 



R. dianthi Schrank- Kinkora (U. S. Ag) : occurs on pinks, carnations and 



German ivy. 

 R. solani Thos. The tomato plant louse : sometimes in destructive numbers 



in Salem and Gloucester Counties I Sin). 

 R. rhois Monell. Plant louse on sumach. 

 R. salicis Monell. A feeder on willows. 



MYZUS Pass. 



M. ribis Linn. The currant plant louse: Rutherford (U. S. Ag.), rarely 

 plentiful enough to cause injury. 



M. cerasi Fab. Very abundant on cherry throughout the State and some- 

 times does serious injury : spraying should be done thoroughly in late 

 September to kill off the sexed forms. 



M. mahaleb Koch Occurs abundantly on peach, plum and a great variety of 

 other plants. 



M. persicse-niger E- A. Smith. The black peach louse : occurs plentifully 

 throughout the southern part of the State, the underground form often 

 doing serious injury on young trees. North of the red shale I have not 

 met with it in numbers : apply tobacco dust in a trench about the trees 

 or give a heavy dose of kainit, broadcasted, against the root form. 



DREPANOSIPHUM Koch. 

 D acerifolii Thos. Common on the soft maple, Acer dasycarpum. 



APHIS Linn. 



A. asclepiadis Fitch. Sometimes common on milk-weeds. 



A. brassicae Linn. The cabbage plant louse, common throughout the State 

 and often seriously injurious in the southern counties. 



A. cornifolise Fitch. Found on the dogwood. 



A. cerasifolise Fitch. On the leaves of the wild cherry. 



A. crataegifoliae Fitch Occurs on hawthorn. 



A. diospyri Thos. Found on persimmon. 



A. gossyph Glover = cucumeris Forbes. The "melcn louse," often seri- 

 ously destructive in Monmouth, Burlington, Gloucester, Salem and 

 Camden Counties, but occurring also in all other parts of the State. It 

 has a wide range of food-plants, including most of the common weeds 

 and is one of the species found on the roots of strawberries (Sm). 



A. mali Fab. The apple louse : always present throughout the State early in 

 the season and sometimes in great numbers, causing severe injury. 

 Spray very early in the season, as soon as the buds are beginning to 

 open, for at this time the eggs are hatching, and the stem-mothers are 

 easily destroyed. 



