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The. Suffolk County. [ N. Y,] Farm Bureau (395), in 1933- reported that on 
Long -Island all the rotenone products were effective against cabbage worms. 
The dusts contained 0.5 percent of rotenone, and 'the sprays were used at 
the rate of 2 quarts of extract to 100 gallons of water. Proprietary pro- 
ducts tested included Derox, Cubor dust, Cubbr spray, and Hellthspra No. 1. 
In discussing white's ( 479 ) paper presented in 1933, Ginsburg consented 
that recent investigations have "shown that rotencne is not the main toxic 
principle of d.e.rri-6 'so far as chewing insects are concerned. Derris from 
which all rotenone had- been extracted proved to be just as toxic to cabbage 
worms as derris containing 1. "5 percent or more of rotenone. [it is prac- 
tically certain, that Ginsburg did not extract all the rotenone by the pro- 
cedure used.— R.C.Ri. ]" ■ 
Bock (38) in 1934 reported the results of tests with Derris elliptica , 
which was tried as' a spray material in the following mixture: 125 gm. of 
soft soap plus 100 gm. of' derris tincture (percolation with fuel alcohol in 
proportion 1:5) plus 7 liters of water. Experiments were made against 
caterpillars on fruit trees, berry bushes, ornamental shrubs, roses, and 
vegetables. In all cases, the derris preparation proved equal to the 
"Nosprasit" and arsenical mixture used for comparison. The soap could be 
replaced by soap bark without detriment. 
At the 1934 meeting of the American Association of Economic Entomolo- 
gists, as reported by the United States Department of Agriculture, Bureau 
of Entomology and Plant Quarantine, ( 437 ), Cory led a discussion of field 
results with arsenical substitutes for the control of vegetable insects. 
Watson, of Florida, reported successful control of cabbage worms with some 
of the commercial rotenone preparations including Cubor. Robinson, of 
Alabama, reported derris-talc and derris-sulfur dusts (0.5 percent rote- 
none) effective' in the control of various cabbage worms. Kutson, of 
Michigan, reported trying various combinations of derris and pyrethrum 
against caterpillars on celery and cole crops with strikingly suoeessful 
results. Satisfactory diluents were flour, talc, bentonite, china clay, 
300-mesh dusting sulfur, tobacco dust, silicated infusorial earth, and 
finely ground gypsum. 
Currie (88) in 1934 reported that in the Salinas, Calif., area dorris 
dust gave good results against cabbage worms, 
Garman and Turner ( 155 ) in 1934 recommended a dust containing 0.6 per- 
cent of rotenone for the control of cabbage worms. 
♦ 
Hamilton and GemmeB ( 181 ) in 1934 compared the effectiveness of derris, 
pyrethrum, and hellebore powders against the cabbage worm. The derris-clay 
dusts (rotenone 0.5 and 1,0 percent) were best, hellebore next best, 
pyrethrum (1,16 percent pyrethrins) the poorest. A dust containing both 
derris and pyrethrum gave good results. 
