266 



HBMIPTERA-HOMOPTERA. 



little or nothing to do with the usual aphis blight. The Hop 

 Aphis is easily controlled by spraying or washing with soft-soap 

 and quassia or, better still, tobacco wash. 



Woolly Aphis {SMzoneura lanigem). 



The Woolly Aphis is a widespread species affecting fruit-trees. 

 Its presence can easily be detected by the quantity of white 

 cottony wool produced by the larvse and apterous females. We 



1 



Fiu. 163. 



1, Winged femalo, Woolly Aphis, niagnilied ; and line showing naturul size. 2, Wing- 

 less viviparous female, magnilieil. 3, Ajiple twig, covered by woolly aphides. 



often, especially in west-country orchards, see this white excretion 

 hanging from the trees in great festoons. The trees sufifer severely. 

 Apple-trees are those that suffer most, but pear-trees and hawthorn 



