-167- 
Comparative tests were made of derris and cube roots in powdered form and 
as extractives containing the toxic ingredients for the control of cabbage 
worms. Field tests indicated that extractives were inferior to powdered 
root for sprays, and that sprays 'were not so effective as dusts. For spray J 
purposes the most satisfactory results were obtained with a mixture contain-} 
ing 4 pounds of powdered derris root to 100, gallons of water in addition to 
neutral coconut-oil soap, penetrol, or skim-milk powder as a sticke r. For 
dusting, equally satisfactory results were obtained with derris and cube 
mixtures (0.5 to 1.0 percent rotenone) containing talc, clay, or air-floated^ 
gypsum as the diluent. 
The Texas Agricultural Experiment Station ( 404 ) in 1936 reported that 
derris mixed with sulfur gave better control of cabbage worms at TTeslaco 
than when .mixed with a finely ground clay or with hydrated lime. 
The United States Department of Agriculture ( 426 , 427 ) in 1936 and 1937 
reported as follows: 
"Laboratory and field tests with organic insecticides, particularly! 
derris and cube, have brought many modifications in the recommendations 
for the control of certain insect pests. It has been demonstrated that; 
these insecticides, which do not leave residues objectionable from the » 
standpoint of human health, can be effectively used against a number 
of different truck-crop pests, such as certain cabbage worms." 
Ytlhite in 1936 and again (482) in 1937 recommended derris for the con- 
trol of several insects attacking certain vegetables, small fruits, and 
tobacco, and implied that cube may be used in place of derris. Cube is 
specifically mentioned as follows: 
"Preliminary experiments in California have shown that derris, or 
cube, or pyrethrum-dust mixtures, at the dilutions mentioned for cab- 
bage, gave as satisfactory results in the control of the three more 
common species of cabbage worms on cauliflower as they did on cabbage." 
The Wisconsin Agricultural Experiment Station (487) in 1937. .reported 
that alkaline diluents (e.g., hydrated lime, pil 12.5)' reduce the effective- j 
ness of derris and timbo for cabbage worms, but the more acid samples re- 
tain their effectiveness in storage. 
Bourne and Boyd (42) in 1937 gave directions for the control of cabbage 
worms. When caterpillars first appear apply a fresh pyrethrum-dust mixture 
containing at least 30 percent of pyre thrum or a rotenone mixture contain- 
ing 0.5 to 0.75 percent of rotenone, using about 30 pounds to the acre. 
Commercial rotenone sprays or dusts may also be used. They should be di- 
luted as recommended by the manufacturer. Usually it is advisable to treat 
tho entire planting, but in cases of light or "spotty" infestations only 
the infested plants neod to be treated. 
Consumers Research (80) in 1937 recommended the following rotonone 
products for use against cabbage worms: Dorox, D. P. T. Dust, Kubatox Dust, 
Kubatox Liquid, Red Arrow Insect Spray, Rotecide, and Rotocido Dust, 
