Insects, etc.. Injurious to the Damson. 253 



Table Showing Life-History of Hop Aphis. 



A. DAMSON, Etc. 

 Winter. Ova 



B. HOPS. 



Wingless Females (rare) Vivip. 



Spring. 1st Vivip. Wingless Females Wingless Females Vivip. 



/ I \ 



3 generations of same 



I I 

 Wingless Females Vivip. 



I 1 I 



May 



and 



June. 



Pup* 



Winged Vivip. Females 



Best of Summei:' None present 



Autumn. 



Wingless Females Vivip. 



Wingless Females Vivip. 

 Winged Vivip. and Wingless Vi^'ip. Females 



III! 



Wingless Vivip. Females (lice). 



Wingless Vivip. Females 



Pupffi. 



W^inged Vivip. Femalen 



Winged Vivip. Females 



1 1 ! II ! II !! I II I II II 1 1 1 1 1 ! I t;;::^:^^^ 



-^ 



Ovigerous Females 



and Winged Males 



Winter. 



Ova. 



Few Wingless Females 



