Maine; agricui^turai, experiment station. 1910. 333 



of a reddish-brown color, and abundantly covered, especially 

 in the aerial form, with a flocculent waxy excretion. 



In October or November, among the wingless ones, numbers 

 of winged individuals appear, which are also all females, and 

 are the parents of a true sexed generation of minute, wingless 

 lice, the females of which give birth to a single "winter egg." 

 This egg is attached within a crevice of the bark. 



The winged females appear somewhat abundantly in autumn, 

 and are one of the means of the dispersal of the insect. They 

 are very minute, clear-winged, gnat-like objects, greenish- 

 brown, almost black in color, with the body covered with more 

 or less of the cottony excretion. 



REMEDIES and preventives. 



The foregoing account of the habits and characteristics of 

 the woolly aphis will enable us to suggest certain measures to 

 control it. The aerial form presents no especial difficulty, and 

 can be very readily exterminated by the use of any of the 

 washes recommended for plant-lice, such as kerosene emulsion, 

 tobacco decoction, a strong soap wash (Formulas 7, 9, 11), etc., 

 the only care necessary being to see that the wash is put on 

 with sufficient force and thoroughness to penetrate the cover- 

 ing and protecting cottony excretion. If the wash be applied 

 warm, its penetration will be considerably increased. 



The much more important root form, however, is more diffi- 

 cult to reach and exterminate. The common recommendations 

 are of applications of strong soap or tobacco washes to the soil 

 about the crown, or soot, ashes, or tobacco dust buried about the 

 roots ; also similarly employed are lime and gas-time. 



Badly infested nursery stock should be destroyed, since it 

 would be worth little even with the aphides removed. 



AA. INJURING THE FOLIAGE. 



(Divisions a, b, c, and d). 



a. Plant lice, small greenish, blackish or reddish lice-like sucking 

 insects. 



1. Greenish plant lice in colonies causing leaf curl. (fig. 33). 



Green Apple-aphis. Page 336. 



2. Reddish plant lice in colonies causing leaf curl. 



Rosy aphis. Page 337. 



