- 45 - 
Cube was slightly better than deiris against the "boll weevil and 
about equal to derris against the leafworn, while derris was slightly nore 
effective against the tarnished plant bug. Calcium arsenate was more 
effective than cube against the boll weevil and the leofwom. 
Chapnan, Hollingsworth and Robertson (?1) reported only slight re- 
duction in the pink bollworn infestation in plats heavily dusted with a mix- 
ture of 20 percent cube and 80 percent sulphur (l percent rotenone) at 
Presidio, Tex., in 1935. Cube (5 percent rotenone) used as a spray, 10 lbs. 
to 50 gals, of water and 2 lbs. of flour, also gave very little control. 
Chapnan and Willians (72) reported that a dust of 10 percent cube, 
10 percent pyre thru i, and 80 percent sulphur (0.43 percent rotenone) used 
against the pink bollworn in cage tests in 1336 was not so effective as 
bar run fluo silicate or calciur; arsenate. 
McKinncy (273) in September 1936 reported that the application of dust 
mixtures containing 1 percent rotenone, derived from derris or cube, with 
talc as a diluent, proved effective in controlling the western striped cu- 
cumber beetle, Diabrotica trivittata Mann., on cantaloupes in the Salt River 
Valley, Ariz. Treated plots yielded approximate] y 1.6 times more fruit than 
did untreated plots grown under comparable conditions, and the xorotected 
plants also produced more fruits earlier in the season, when prices were 
high. 
Murphy and Vandehburg (283) in 1935 wrote that most household sprays 
contain as the insecticidal principle an extract of pyrcthrun flowers, an 
extract of derris or cube root, a solution of an aliphatic thiocyanate, or 
some combination of these toxic agents. 
The Kew York (Geneva) State Agricultural Experiment Station (304) in 
its annual report for 1335 (published in 1936) stated that when stomach in- 
secticides are needed for the control of the imported currant worm on cur- 
rants a rotenone spray or dust may be used. Studios made in 1934 show that 
derris or cube dusts containing from 0.3 to 0.5 percent rotenone were very 
effective in killing the currant worm. 
Extensive experiments v/ere conducted in western Uew York in 1334 on 
the control of the cabbage aphid and cabbage worms on Danish cabbage. Both 
of these insects were unusually prevalent and caused serious damage in many 
fields. Derris dust containing 0.5 per cent rotenone proved more satis- 
factory for worn control than arsenate of lead or calcium arsenate, but ap- 
peared to have little value in protecting the plants against the cabbage 
aphid. On such crops as broccoli, cauliflower, brussels sprouts, and early 
or loose header cabbage, a derris dust is advised to avoid arsenical residues. 
Where the cabbage aphid becomes abundant on these crops it will be necessary 
to make a separate treatment of a 4-pcrcent lime-nicotine dust, since derris 
and lime are not compatible. 
Comparative tests were; made of derris and cube roots in powdered form 
and as extractives containing the toxic ingredients for the control ®f cab- 
bage worms. Field tests indicated that extractives were inferior to powdered 
