-3- 
Ilelittia satyriniformis Hbn., the squash borer 
At trie 1934 meeting of the American Association of Economic Ento- 
mologists, as reported by the United States Department of agriculture 
Bureau of Entomology and Plant Quarantine (437), Cory led a discussion 
of field results v.*ith arsenical substitutes for the control of vegetable 
insects. Eeadlee, of New Jersey, stated that the squash borer is among 
the insects that may be controlled with derris dust. 
Burdette (55) in 1935 recorded results of tests with three derris 
dusts and one derris snray, all materials being apolied three times to 
*■«'•' ° i care 
the stems and basal portions of the plants only, /being taken "to cover 
all parts thoroughly, beginning July 10, when eggs were first found. 
The dusts were applied with a Vcrmorel puff duster and. the spray with a 
Vermorel hand sprayer. The total amount of dust applied per acre ranged 
from 55 tc 65 pounds . 
Material 
Derris 25 + talc 75 (rotcnone = 1 
percent) 
Derris 20 + sulfur 25 + clay 55 
(rotcnone = 1 percent) 
Increase in borer- 
; free vines over 
.check. 
Percent 
83*5 
71.3 
Increase in 
weight of squash 
over check. 
P ercent 
33. 5 
74.5 
Pyre thrum extract in a carrier 
+ derris 
Lead arsenate 3 pound s/l 00 gallons 
+ '1 percent oil 
37.4 
51.7 
39.3 
29.5 
Hcadlce ( 136 ) in 1935 reported tests made in New Jersey with derris 
as a substitute for arsenicals on vegetables . The squash borer is among 
the insects that may be controlled by derris -dust. 
The New Jersey Agricultural Experiment Station ( 292 ) in 1935 repor- 
ted that a mixture of 20 parts of finely ground derris root (5 percant 
rotcnone and 18 to 20 percent total acetone extractives), 25 parts of 
finely ground sulfur (300-mesh), and 55 parts of finely ground clay con- 
trols this insect. 
The most effective insecticidal treatment, according to th<- Massa- 
chusetts Agricultural Experiment Station (270) in 1937, was a spray pre- 
pared from cube powder at the rate of 5 pound s in 100 gallons of water, 
and made wettablc with fish-oil soap at the rate of 1 quart in 100 gal- 
lons of s;"ray. This reduced the injury 74 percent. S 1 . 1th 
nicotine sulfate 1:500 plus 1 percent of sumner oil was mere effective 
