154 DISEASES OF THE SWEET PEA 



"Like the gipsy moth, the pea aphis seems 

 to have been present in this country for 

 afcout twenty-five years before it became a 

 pest. It is now found practically wher- 

 ever the garden pea and the sweet pea are 

 grown, causing much injury to both hosts. 



"The reasons why the species has be- 

 come so troublesome a pest are many: 

 First, because of its ravages to a crop hith- 

 erto little troubled by insects except the 

 pea weevil, which has always been present 

 in gardens and fields and has come to be 

 looked upon as a necessary evil. Second, 

 it is a species never before noticed so far 

 as records go as having been destructive to 

 peas of any kind in this country. Third, 

 because of the great difficulty in keeping it 

 in check. 



"Although garden and field peas are the 

 crops most injured by this pest, sweet peas 

 and red and crimson clover, as well as 



