-107- 
Tho Division of Control Investigations of the Bureau (444) in 1038 report- 
ed results of tests with derris and cube on the imported cabbage worm, as 
follows: 
* 
: Dosage 
■ 
Material 
• Instar 
: per sq. 
cm a 
: Mortality 
Micro grains 
Percent: 
Hours 
Derris 
(rotenone 4.5 percent; 
total extractives 19 percent) 
as a 
dust 
Fourth 
100 
100 
48 
Do, 
do. 
100 
100 
72 
Do. 
Third 
120 
100 
48 
Do. 
do. 
120 
100 
72 
Do. 
Second 
120 
100 
48 
Do. 
do. 
120 
100 
72 
M.l.d. of derris 
and 
cube powders in 48 
hours 
Instar 
M.l.d. 
Fifth 
— _... 
Fourth 
100 (5) 
Third 
120 
Second 
120 
First — 
The Bureau (448 ) in 1939 quoted the county agent of Crawford County, 
Ind., as reporting that rotenone- sulfur dust used against the imported 
cabbage worm gave 100-percent kill in every case* 
Crosby and Chupp (86) in 1934 recommended the application of a dust 
containing 0*5 percent of rotenone at the rate of 25 to 30 pounds per 
acre for the control of leaf-eating caterpillars, including the imported 
cabbage worm, on cabbage, cauliflower, brussels sprouts, broccoli, kale, 
and similar crops on Long Island* 
Gilbert and Popenoe (1 59 ) in 1934 wrote that rotenone dusts, such 
as those produced from derris or cube roots, had given the best control* 
Satisfactory results wore obtained by using 10 to 15 pounds per acre of 
dust containing from 1 to 2 percent of rotenone. Pyrethrum dusts and 
extracts were also offective. As these dusts and extracts vary in 
strength they should be used according to the manufacturer's directions* 
Used as a test insect by Ginsburg and Granett ( 165 ) in 1934. 
under Bombyx mo ri L. , on p* 9» 
See 
McCampbell (25£) in 1934 recommended derris dusts for control in 
Colorado, Two or three dustings with a product containing 1 percent of 
rotenone, applied at the rote of IB to 30 pounds per acre, protected 
the 1933 cabbage crop in the Denver section af^inst this species. 
