- 15 - 
Q-137 
In laboratory cage tests in 1950, average and heavy dosages of a 
dust containing 3 percent of Q-137 showed only moderate toxicity to 
third- and fourth-instar pickleworms. A 5-percent dust was one of the 
least effective insecticides used on field plots in experiment 1 of 1950, 
but gave almost adequate control of the light pickleworm infestation 
(table 3). Q-137 showed no phytotoxicity to cucumbers. 
Rotenone 
Insecticides containing rotenone showed little toxicity to fifth-instar 
pickleworms in laboratory cage tests. A 1 -percent rotenone dust killed 
only 20 percent of these larvae; a 2-percent dust killed 70 percent. The 
effectiveness of a 1 -percent rotenone dust was not appreciably increased 
by addition of 1 percent of either piperonyl butoxide or compound 469. 
One-percent rotenone dusts did not give adequate control of the 
pickleworm in field tests (table 3), even though in 1951 they were 
preceded by lindane and accompanied by zineb. During the fruiting 
period of cucumber growth in 1950, populations were too low for the 
value of 1.5- and 2-percent rotenone dusts to be determined. Addition 
of piperonyl cyclonene, n-propyl isome, nicotine, or mineral oil did 
not significantly increase the toxicity of a 1 -percent rotenone dust in 
1948 and 1949 (table 3). A dust containing 0.15 percent of pyrethrins 
and 0.5 percent of rotenone was ineffective on cucumbers in 1948. 
Ryania 
A dust containing 40 percent of ryania did not give adequate control 
of the pickleworm in 1948 and 1949 (table 3). 
Sabadilla 
A 20-percent sabadilla dust did not provide adequate protection 
against the pickleworm, but this dust tended to be slightly more effec- 
tive than rotenone, pyrethrum, allethrin, and ryania dusts (table 3). 
Addition of 0.5 percent of nicotine plus 2 percent of polyethylene glycol 
(600) monolaurate did not significantly increase its effectiveness in 1951. 
In the 1950 planting the pickleworm infestation was too low for the value 
of a 25 -percent sabadilla dust, with and without piperonyl butoxide and 
nicotine, to be determined. 
