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There -was practically no difference "between the efficiency of the derris 
dust containing 0.5 percent of rotenone and that of calcium arsenate, but 
a derris-dust mixture containing 1,0 percent of rotenone, applied at in- 
tervals of 2 weeks, was distinctly superior to the other 3 materials 
tested. 
Haude in advertising literature published by John Powell and Co., New 
York, N. Y. , in 1939 recommended/^rris dust (0.75 percent rotenone) at the. 
rate of 15 to 20 pounds per acre for the control of the cabbage webworm in 
South Carolina. 
Lineodes Integra Zell, 
Compton (77) in 1937 reported on this species, a potential pest of 
greenhouse tomatoes. Greenhouse tests were made with a 0,5 percent rote- 
none dust composed of 10 pounds of ground derris root having a rotenone 
content of 5 percent and 90 pounds of talc. This dust was effective in 
holding the insect in check, but did not give so complete control as did 
the 85:15 sulfur-lead dust. 
Loxostege commixtalis (Walk. ), the alfalfa webworm 
L. sticticalis (l.), the sugarbeet webworm 
McCampbell (259) in 1934 recommended derris dusts for the control of 
these species on cabbage in Colorado. 
Ma rue a testulalis (C-eyer), a bean pod borer 
See United States Department of Agriculture, Puerto Rico Experiment 
Station ( 450 ) under Etiella zinckenclla (Treit. ), on page 101. 
The United States Department of Agriculture, Bureau of Entomology and 
Plant Quarantine ( 442 ) in 1936 reported that derris was tested on threo 
species of pod borers attacking beans in Puerto Rico, but was less effec- 
tive than fluorine compounds and none of the insecticides tested to. date 
could be recommended. 
I'fymphuls. depunc talis ( Guen. ) 
The Federated Malay States Department of Agriculture ( 120 ) in 1922 
reported that for dealing with the rice case-worm in the padi nurseries 
spraying was being carried out with a decoction of tuba root. 
Sison (371) in 1938 recorded laboratory tests as follows: Larvae 
with their cases were collected from the field and placed in 3 separate 
containers each with water having a volume of about 200 cc. and a surface 
area of about 0.11 'square meter. Grass was also placed in each container. 
, Twenty- two larvae were placed in the first container and 25 each in the 
second and third. The first container was dusted' with 0.2 gm. of derris 
powder (rotenone, 3,09 percent); the second with 0.13 gm. ; and the third 
with 0.1 gm. The dust covered the surface of the water. With the 0.2 gm. ' 
all the larvae died after about 5 hours, whereas in the last two treatments 
it was about 22 hours before all died. In another trial the derris powder 
was put in the water, then the whole was stirred well before' the larvae 
were placed, so as to got readily the soluble substance from the powder. 
