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The New York State Agricultural Experiment Station ( 501 ) in 1936 repor- 
ted that not all cabbage worms were killed 'by rotenone-containing powders, 
for example the zebra caterpillar. Contact dusts containing pyre thrum or 
nicotine were highly toxic to the early stages of larval development of this 
insect. 
Cirphis unipuncta (Haw.), the armyworm 
The Mova Scotia Department of Agriculture (310) in 1938 reported that 
derris as a poison bait was ineffective. 
Earias fabia (Stoll) 
Butac (58) in 1938, reporting on the life history and habits of the 
cotton bollworms in the Philippines with suggestions for their control, 
stated that on March 2, 1936, 5 caterpillars of the spotted bollworm were 
dusted in the laboratory with a 50;50 mixture (by weight) of derris dust 
(rctenone about 3 percent) and "gawgaw. " One hour after dusting the cater- 
pillars were paralyzed and all died within a day. On' March 24, the test 
was repeated on 10 caterpillars. It was observed, too, that the larvae 
were paralyzed within 1 hour after dusting and all were dead on the second 
day. Cotton plants in one of the plots at the Philippine Carnival Exposi- 
tion were dusted in 1936 with derris-gai/gaw, mainly to control leaf-eating 
caterpillars, which were abundant on the plants. The dusting was done at 
about 9 a.m. Between 2 and 3 p.m. the plants were examined and the insects 
collected, especially those affected by the treatement. They included five 
caterpillars of Earias fabi a, all of which were paralyzed and died after 2 
days „ 
Heliothis armigera (Hbn.), the corn earworm; the bollworm; the tomato fruit- 
worm 
Ditman and Cory (99) in 1931 reported tests w ith proprietary derris 
products for the control of the corn earworm. Derrisol at 1:100 permitted 
a 95-percent infestation, seriously burned 16 percent of the plants, and 
produced a trace of burning in an additional 59 percent. Pulvex was harm- 
less to the vegetation but permitted a 95-percent infestation. 
Burdette (53) in 1932 reported results of tests in which the moths, 
after feeding on an invert sugar sirup (Syrline) containing rotenone, were 
placed in cages. No moths were dead at the end of 48 hours. Similar re- 
sults were obtained with lead arsenate, zinc arsenite, sodium arsenite, 
and arsenious acid. P.otonone, sodium arsenite, and arsenious acid made 
the sirup spray slightly less attractive. In 1934 he (54) reported that 
the moths could be attracted to Syrline (8 lb. to 50 gal. of water) sprayed 
on the corn foliage. An acetone extract of derris added to the sirup was 
ineffective in producing kill but did act as a repellent. 
The South Carolina Agricultural Experiment Station ( 38 ) in 1932 re- 
ported that dusting every other day with Kubatox gave no control in sweet 
corn. This station (381) in 1935 reportod that experiments of the 1934-35 
season indicated that a dust mixture consisting of derris powder and clay 
and containing 0.5 percent of rotenone was not so effective against corn 
earworms on cabbago as were the arsenicals. 
