WOOLLY APHIS. 



183 



happen ; and, for remedy, in use of washes which ai'e 

 known to be suitable for the purpose in hand. 



The Aphides of the remaining four tribes are much 

 fewer in number ; and of these the most important to 

 us, in a farming point of view, is the American Bhght 

 Aphis, Schizoneura lanigera. 



S^O^,; „ ^a:- 



V 



Fig. 141. — "Woolly Aphis: infested Apple-spray, nat. size; wingless 

 viviparous female and young clothed with woolly fibres ; small 

 egg-bearing female beneath the spray ; pupa ; — all magnified. 



The few kinds of Schizoneura that we have may be 

 known by the singly-forked third wing-nerve, and also 

 by the cornicles (or honey-tubes, as they are some- 

 times called) being wholly, or almost entirely, absent. 

 They live in very different places : one, for instance, 

 is found on Black Currant roots in flocky matter, 

 like that of the most destructive kind, which is the 

 American Blight. 



This Woolly Aphis, or American Blight, is chiefly 

 to be found in neglected orchards. The Aphides, 

 shelter themselves for the most part in crevices of the 

 bark, or where a bough has been injured, or under 

 young bark healing over wounds; but they may be 



