-68- 
A derris-nicotine dust with sulfur and hydrated lime gave fair 
results .--Brooks and Allen (91). 
Comparative results, obtained by applying dusts and sprays of 
derris and cube including Black Arrow 88 (4.6 percent of rotenone), 
Black Arrow 77 (3.7 percent of rotenone), and Black Arrow 444 (1.05 
percent of rotenone), showed that derris appeared to be superior to 
ordinary cube in effectiveness. Good kill obtained with micronized 
cube indicated that fine grinding might increase the toxicity. 
Dusts appeared to be slightly better than sprays. Dusts applied at 
high humidity when the dew was on the plants gave slightly better 
results than dusts applied later in the day when the temperature 
was higher, humidity lower, and plants dry.— Ditman and coworkers 
(145). 
Rotenone dusts were slightly erratic in their effect but 
normally gave satisfactory control.— Glasgow (228) . 
A rotenone-talo dust containing 4 percent of vegetable or 
animal oil appeared to have possibilities in Oregon. Rotenone dust 
with a wetting agent did not give as good control as did rotenone 
and oil. Nicotine-lime dust and pyrethrum-talo dust were inferior 
to the rotenone-oil dusts« Loro-talo-rotenone dusts gave good kills 
but produced a slight burning.-- Gray and Schuh (241 ) . 
The determination that derris and cube powders could be used 
to control the pea aphid is one of the high lights of the last 5 
years. An industry which meant a great deal to the prosperity of 
the Pacific Northwest was relieved of a production hazard whioh 
threatened marked curtailment, if not abandonment.— Rohwer (513 , 
p. 61). 
Vaporized niootine gave higher initial kill than did derris- 
talo dusts but the latter had more residual effect. Derris-talc 
dusts plus Vatsol OS were more effective than a similar dust with- 
out a wetting agent. An atomized oil containing rotenone or nico- 
tine gave high kills of the pea aphid, but owing to poor coverage 
failed to give entirely satisfactory results near Norfolk, Va. — 
Walker and Anderson (645 ) • 
In Maryland derris was superior to cube, and derris dusts were 
superior to derris sprays. Moisture on the plants at time of appli- 
cation of derris dusts wes more important to the success of the 
treatment than high temperature. Fine grinding increased the ef- 
fectiveness of both cube and derris. The nicotine vaporizer gave 
the highest kill of all the treatments used. — Ditman and coworkers 
(146)/ 
