PLANT LICE INJURING THE FOLIAGE 201 
If peas are planted far enough apart in rows and the ground is dry, 
the lee may be brushed from the vines and killed by following with 
Fic. 250.— The Pea Aphis. Adults at work on vine. Original. 
a cultivator between the rows. If the ground is wet, the lice may be 
brushed into a long, shallow pan. A little water should be poured 
into the pan and covered with a film of 
coal oil. 
The Bean Aphis (Aphis rumicis Linn.) 
The tender shoots of beans sometimes are 
covered with thickly clustered plant. lice. 
The same species is found commonly on pig- 
weed, dock, and other weeds. The aphis is 
one tenth of an inch long, black, often with 
a few whitish dots on each side; the an- 
tenne are whitish in their central seg- 
ments. Fic. 251.— The Pea Aphis. 
Winter is passed in an egg stage on the — Adult enlarged and nat- 
twigs of wahoo or of snowball. The lice first UT! Size. Original. 
migrate to weeds and then to beans. In late summer, they return 
to the shrubs named. 
