_ a - 
Sprays prepared by adding an acetone solution of rotenone to water 
wore ineffective against the iv mphs.--De.ricy (16) in 1931. 
Jones and Davidson (47) in 1931 reported that rotenone and derris 
extracts prepared with fish oil have a high toxicity to squash bugs, 
Campbell (b) in 1932 reviewed the rotenone tests me.de by Darley 
(16) and Davidson (17) on squash bugs, 
Gnadinger (33) ir. 1933 referred to unpublished work by Ginsburg, 
■who found pyrethrins mere toxic than rotenone to squash bugs. 
The Alabama Agricultural Experiment Station (l) in 1935 reported 
that derris alone was not very effective but when mixed with sulfur was 
of some value as a repellent. 
Derris dusts and sprays were ineffective, according to Kixson 
of Oklahoma, as reported by Cory (87) ir 1935, 
Elliott (18) in 1935 reported tests of insecticides for the con- 
trol of the squash bug. Rotenone dust -killed only about 25 percent of 
the third instars, Eotecide spray at 1:100 was effective against the 
second in star. 
Walker and Anderson (94) in 1935 "reported the results of tests 
made at the Virginia Truck Experiment Station, near Norfolk, Va, On 
two different occasions adult squash bugs migrated into small fields 
of young squash, and in each case ore dusting o r the infested plants 
with a derris dust containing 0.9 percent of rotenone gave very suc- 
cessful control. however, no tests were conducted under conditions of 
heavy infestation or where all stages of ore insect were present. 
The Idaho Agricultural Experiment Station (43) in 1936 reported 
that cube-kaolin dust (0,2 percent rotenone) readily killed nymphs of 
the squash bug, but squash vines soon were reinfested, 
Iiaseman( (37) in 1937 reported testing derris dusts and sprays 
against the squash bug in Missouri without much success, 
C. L. Smith (79) in 19 37 obtained a 92-percent reduction in 48 
hours with a spray oi 3 pounds of derris powder (4 percent rotenone) 
plus 4 pounds 11 ounces of soap; and a reduction of 73 percent in the 
same time ivith a dust containing 0,75 percent of rotenone. These tests 
wer3 made against nymphs. 
Beard (3) in 193C reported on. the control of the common squash 
bug in Connecticut, Several rotenone sprays and dusts were given 
laboratory trials, but none demonstrated sufficient toxicity against 
the bug to warrant field experiments. 
