-116- 
Insccticide Mortality 
Percent 
0.91 kg. of derris root (k nercent 
rotcnone) in 378*5 liters water + 
21.25 gm. of ^0-percent coconut- 
oil soap per 3»72>5 liters 93 
The Few York Agricultural Experiment Station ( 302 ) in 1937 reported 
that field tests of powdered derris, cube, and timbo root of comparable 
analytical quality showed that such powders were about equal in effective- 
ness. Dusts of C.5-percent-rotenone content gave optimum results and those 
of 0,33-percent-rotenone content gave results that were commendably satis- 
factory, considering costs. Spray mixtures containing k pounds of a good 
'gre.de of powdered root in 100 gallons of water, with a sticker, gave fair 
results, but were not so effective &s the dusts. 
C. E. Smith ( 372 , 373) in 1937 reported tests made at Baton Rouge, 
La. In field experiments involving several species of cabbage worms 
— principally A utographa brassicae (Riley), H e 1 lul a un da. 1 i s (IP,), and 
Pieris rapae (L.) — a dust mixture of peat pose containing 2 percent 
of nicotine was distinctly inferior in insecticidal efficiency to derris-dust 
mixtures containing 0,5 and 1.0 percent D.f rotenone, as well as to an un- 
diluted tricalcium arsenate. There was practically no difference between 
the efficiency of the derris dust containing 0*5 percent of rotenono and 
that of calcium arsenate, but a dorris-dust rixture containing 1.0 percent 
o'f rotenone was distinctly superior to the other three materials tested, 
when applied at intervals of 2 weeks. 
Derris powder (h percent rotenono) at 2 pounds per 100 gallons of 
water plus about 2 pounds (.anhydrous ba.sis) of coconut-oil soap reduced 
he peculation 93 percent 2^- hours after ap .lication. — C. L. Smith 
( 373 ) in 1937. 
Gunderson ( 173 ) in 193& recommended derris with or without sulfur 
for the control of cabbage worms, including the imported cabbage worn. 
Flour, sulfur, pearl dust, gypsum, or 6ther carrier war recommended as a 
diluent. A 1-percent-rotenone dust is generally strong enough for all 
needs. 
The Louisiana Agricultural Experiment Station (258) in 193^ pub- 
lished a summary of entomological progress in that State, E. E. Smith 
reported that against the imported cabbage worm derris dusts contain- 
ing 1.0 and 0.5 percent of rot. none were most effective. Paris 
and lime (1:9) was thd only other treatment that showod oompar 
effectiveness. 
The New York County Agents' Tr 5 School ( 299 ) in 1938 dis- 
cussed the control of insects attac) . 1 ' tt, 
Hcrvcy, and others recommended "rotenono dusts con- 
trol of the cabbage looper and the imported cab": follow 
Rotenone dust contain "t of roteno: proved to bo OX 
of the most effective treatments for cabbage worm control. The dr: - 
back to the use of this material is its cost, as comp rod with that of 
