140 
Fig. 32. Pea-louse, Macrosiphum pisi, empty skin after the 
emergence of a winged parasite. Greatly magnified. 
Fig. ?,?,. 
Pea-louse, Macrosiphitiii pisi, attacked by fungus. 
Greatly magnified. 
Remedial Measures. — Sprays of kerosene emulsion or whale- 
oil soap solution are probably the best remedies known. They 
should be applied at the first appearance of the lice, and continued 
as needed. 
The brush and cultivator method is also much used. With this 
in view the peas must be planted in rows at least two feet apart. 
As soon as the lice infest the vines, and at intervals subsequently, 
they are brushed from the vines and covered by a cultivator before 
they can get back. Brooms made of fresh-cut pine branches ha^•e 
been suggested for brushing the lice from the vines. 
POTATO 
The potato is the most important vegetable grown in Illinois, 
both in acreage and \ahie i)f the crop. Tho it is attacked by a 
