-163- 
Huckett ( 199 ) in 1934 reported that dusts containing 0,5 to 1.0 percent 
of rotenone were used in 1933 to protect 4,000 acres of late cauliflower on 
Long Island against worms. About 275,000 crates of cauliflower were sold 
by the Long Island Cauliflower Association and about 150 tons of derris 
dusts were sold by dealers on Long Island at a price of from 12 to 14 cents 
per pound, as substitutes for calcium and lead arsenates. He ( 200 ) also 
reported in 1934 that against insects attacking vegetables, derris dusts 
have usually been slightly superior to derris sprays. For cabbage worms 
effective control may be obtained by the use of a derris-clay, kaolin, or 
talc-dust mixture containing not less than 0,5 percent of rotenone, applied 
much in the same manner as recommended for arsenical dusts. Hydrated lime 
or a mixture of hydrated lime and monohydrated copper sulfate effects rote- 
none adversely, hence their use as a diluent for derris dust is not recom- 
mended. During the summer months, it will usually be found necessary to 
apply sprays or dusts once every 10 days to 2 weeks, but with the shorter, 
cooler days of autumn once every 2 to 3 weeks may be satisfactory. If 
derris powder is applied in a spray mixture, a strength comparable to 10 
pounds of a derris-clay dust (1 percent rotenone) should be used in 100 
gallons of water, or 2 pounds of an undiluted powdered derris root of 
5-percent-rotenone content in 100 gallons of water, plus in either case 4 
pounds of a spreader, such as dry skim-milk powder, or a miscible sulfonated 
oil or neutral coconut-oil soap, 2 quarts, 3oth derris powder and skim-milk 
powder should be made into a- paste before being added to the tank. Hydrated 
lime, bordeaux mixture, and ordinary laundry soap are considered undesirable 
in a derris spray, owing to their adverse effect on rotenone. Although the 
cost of ingredients for spraying may be a little cheaper than for dusting, 
it will generally be necessary to spray at slightly shorter intervals to 
obtain results similar to those obtained with the dust. 
Huckett, in a letter dated May 3, 1934, to W. H. White, submitted the 
following results of tests of proprietary rotenone dusts against cabbage 
worms: 
Treatment 
Plant Injury 
None 
Slight 
Moderate 
to severe 
Derox (0.55 percent rotenone) 
Cubor and clay (50-50) 
Hellthicide No. 1 (l percent rotenone) 
Hellthicide No. 2 (1 percent rotenone) 
Kubatox (0,44 percent rotenone) 
Drimac 
Florote 
Check 
Percent 
Percent 
Percent 
83.1 
15.1 
1.8 
65.4 
28.5 
6.1 
86,0 
12,0 
2.0 
92,4 
5.7 
1.9 
73.6 
22.7 
3.7 
82.0 
14.0 
4.0 
62.3 
26,4 
11.3 
27,5 
43.1 
29.4 
