8 
for picking. Such lice as are not buried in the ground by the cultivator 
will be killed by the dust which closes their breathing pores, while a 
considerable proportion is destroyed also by the force of the brushing. 
This method has the advantage of not being so destructive to the natural 
enemies as other means that might be employed, the aphis being more 
fragile and delicate than any of its insect enemies. Moreover, peas 
planted in rows to permit of frequent cultivation suffer much less injury 
than when sown broadcast. As soon as the last picking has been made 
infested plants should be promptly destroyed by plowing under.! 
Fia. 5.—Field of peas saved by brush-and-cultivator method, showing implements used. 
The brush-and-pan method.—A method which consists in jarring the 
aphides from the vines into specially prepared, long, shallow pans in 
which a little kerosene is floating, dragged between the rows, has given 
good results, the insects as they come into contact with the kerosene 
being all killed. A bushel of “lice”? was caught to each row, 125 rods 
long, in one instance where this remedy was used. It is practicable 
only for small areas. 
‘We have abundant testimony to the value of this method, but perhaps none 
more striking than that on the farm of Mr. C. H. Pearson, a Maryland pea- 
grower. During the season of 1900, a 600-acre pea plantation was practically 
saved by this method. After other means had failed, the fields were brushed 
and cultivated every third day for a.period of two weeks. The previous season 
peas over the same area were sown broadcast; so that it was impossible to combat 
the pest in this manner, and as a consequence 480 acres were entirely ruined. 
(Bul. 20; n.'s., \p..94; Bul. 26;p. 57, Div. Ent;, U.9S..Wept. Aer.) 
A6—49_ 
