102 STATE BOARD OF AGRICULTURE. 



The rate of increase among these insects is such that were it not for numer- 

 ous natural checks they would soon replace every other living thing upon the 

 earth 



Remedial measures are, winter pruning if eggs are noticed, the cuttings to 

 be burnt, of course ; application of contact insecticides early in the year to 

 destroy the stem-mothers ; application of contact insecticides at any time when 

 the insects are noticed. The poison may be either pyrethrum or tobacco decoc- 

 tion, soapsuds or a kerosene mixture— mechanical or emulsion. It must be 

 brought into actual contact with the insects and therefore a fine spray nozzle 

 should be used at all times when an application is made against these species. 



Under some circumstances cold water will kill plant-lice and a cold storm in 

 middle or late June will play havoc with the migrating forms and may practi- 

 cally exempt the alternate food-plant for the season. 



The best and most satisfactory method of dealing with the subject is to use 

 the kerosene emulsion, and spray liberally and frequently. In the melon field 

 cover the infested hills, and to each cubic foot of space beneath the cover 

 evaporate one dram of bisulphide of carbon, allowing the covers to remain on 

 an hour at least. 



In this family Mr. Theodore Pergande has kindly furnished numerous notes 

 &c, particularly as to food-plants. 



Sub-family APHIDIN.E. 



NECTAROPHORA Koch. 

 N. liriodendri Mon. On the tulip tree, common at Vineland in 1899. 

 N. pisi Kalt. Common on pea, shepherd's purse and other plants. 

 N. rudbeckise Fitch. Occurs on golden-rod, rag-weed and Rudbeckia. 

 N. rosae Linn. Common everywhere on the rose : tobacco decoction applied 

 early, is the best remedy against this. 



N. rubi Kalt. The blackberry plant louse, occasionally abundant near Ham- 

 monton. 



N. fragariae Koch. A strawberry plant louse ; var. immaculata Riley, is 

 likely to occur in New Jersey. 



N. sonchi Linn. Plant louse on Sonchus oleracea. 



N. viticola Thos. Plant louse on grape. Perth Amboy, Montclair ( U. S. Ag. ) 



N. granaria Kirby = avena3 Fitch. The grain or "wheat louse"; found 

 throughout the State ; sometimes common and injurious in the southern 

 counties ; generally kept in check by its parasites, and when it does 

 increase abnormally insecticide applications are generally impracticable. 



N. lactucse Kalt. The lettuce plant louse. 



N. menthse Buckt. Plant louse on mint. 



N. destructor Johns. Very injurious to peas in 1899. 



PHORODON Pass. 



P. humuli Schrank. The hop plant louse ; occurs sparingly throughout the 

 State : Freehold ( U. S. Ag). 



