-36- 
This pest can be controlled in green peas and dried peas by use 
of derris dust mixtures (0.5 to 1 percent of rotenone) • Large-scale 
field tests in 1940 showed that dust mixtures of derris, cube, or 
timbo (0.75 to 1 percent of rotenone) applied at rates ranging from 
25 to 40 pounds per acre gave satisfactory control. A hood or a 
short trailing canves on the dusting machine increased the efficiency 
of the treatment by preventing excessive wind drift.— Br indley and 
coworkers (88). 
Satisfactory oontrol in 1941 was obtained by dusts of derris, cube, 
or timbo mixed with talc or diatomaceous earth to contain 1 percent of 
rotenone, and applied at the rate of 20 pounds per aore. As many as 
three applications nay be necessary.— Br indley (87)» and Knowlton (343) t 
The pea weevil can be readily controlled by the application of a 
0.75- to 1-peroant rotenone dust*-- Glasgow (£28 , 229) . 
Rotenone dusts were effective, but their successful use requires 
mechanized dusters and effioient operation. Observations on 13 dust- 
ing machines were taken near Moscow, Idaho. In the Falouse area 
200,000 pounds of dust were applied, and the weevil deokage on the 
treated fields was less than 5 percent while on the untreated fields 
it was 15 percent.— Humphrey (301) . 
Precautions taken in one district in Utah to prevent infestation 
by the pea weevil of peas intended for canning included careful exam- 
ination of the fields by sweeping, dusting with a 1-percent mixture of 
rotenone and talo at 20 pounds per acre, and removal of chance infested 
plants just before harvest.— Moss (430) » 
Tests of different materials as substitutes for derris, cube, or 
timbo against the pea weevil were unsuccessful although pyrethrum, as 
well as certain dinitro oompounds, might be useful.- U. S. Bureau of 
Entomology and Plant Quarantine (62£ » p. 35) • 
Rotenone dusts applied to peas, for drying, when they came into 
flower, did not give complete oontrol of the pea bruohid in Washington, 
and fumigation of the harvested crop was therefore necessary. The 
use of rotenone on Austrian peas grown for seed was prohibited in 1942 
in order to conserve the Supplies of rotenone for crops used as human 
food, and fumigation was compulsory*— Webster and Riohmann (663 ) ♦ 
In 1942 rotenone was the standard insecticide for the pea weevil. 
Nicotine was ineffective.— U. S. Bureau of Entomology and Plant Quaran- 
tine (628; j Mclndoo (383). 
