CHERRY APHIS. 



49 



CHERRY. 



Cherry Aphis. 



2Ii/ziis cerasi, Fab. ; Aphis cemsi, Fab., and many writers. 



Myzus cerasi. — 1, Nvinged viviparous female ; 2, wingless viviparous female ; 

 3, pupa : much magnified. After G. B. Buckton, F.K.8. 



Infestation of "Cherry Aphis" is distinguishable by the 

 black masses with which it not only clusters in thousands on 

 the under side of Cherry leaves in gardens and orchards, but 

 also in bad attacks extends to the tender shoots, buds, fruit 

 stems, and even sometimes to the green fruit. It appears in 

 early spring ; and in Cherry orchards is the cause of great 

 mischief by the suction of these vast numbers of aphides 

 drawing away the sap from the parts attacked, and thus 

 causing the leaves to dry up and wither, and destroying the 

 young shoots. Likewise from the excretion of fluid through 

 their " cornicles," or "honey-tubes," everything in reach is 

 covered by this gummy exudation, the pores of the leaves are 

 choked, and the infested portions reduced to a filthy mass of 

 black Plant-lice, excreted matter, and ruined leafage and 

 shoots. 



