- 5 - 
Hockenyos ( 41 ) in 1940 discussed bedbug control. Rotenone 
and derris are unquestionably effective. Derris powder kills bedbugs 
in a few hours. . V.all paper impregnated with rotenone kills bedbugs in 
contact with it. The kill does not start until about 48 hours after 
contact and some bugs survive for 96 hours. The sprays tested were 
made up in different ways, with the rotenone in true solution in some 
cases and in a state of colloidal suspension in oil in other cases „ 
One percent of rotenone was used ir these tests. The ivallpaper was 
dipped in the rotenone solution or suspension and then thoroughly dried. 
One suspension, in which dissolved rubber "was the suspending agent, was 
tried on a practical scale and, although it gave results superior to 
these obtained with ordinary nonresidual killing agents, it is doubtful 
whether the practice could be regarded as economical. Occasionally 
operator:; apply a paste to beds that are subject to frequent reinfesta- 
tion. Such a paste nay be made by dissolving 1 ounce of derris resin 
in 1/2 pint of oleic acid with gentle heating and then adding this 
solution to sufficient' vase! ine to make up a quart. This may be 
brushed into the cracks and other hiding places cf the bugs. 
Coreidae 
Acanthoc oris soabrator (F.) 
The Federated Falay States Department of Agriculture (23) in 
1934 reported that adults and larvae of this bug were used as test 
insects in spraying and dusting experiments with derris. The adults 
were also used in tests made the following year (24). 
Filler (64) in 193' published a report on the toxic value of 
different specie" of derris in which tests on this insect arc recorded. 
Owing to its active habits, this species is unsuitable for use in- 
spraying experiments but was used in immersion experiments. The 
adults immersed in a suspension of rotenone 1:5,000 (prepared by 
adding an acetone extract to water), plus sulfonated castor oil, 
suffered an average mortality of 56 percent in 4 days; the sulfonated 
castor oil alone produced a mortality of 30 percent in the same time. 
with tannic acid added as a stabilizer rotenone at 1:2,000 killed an 
average of 60 percent and at 1:4,000 it hilled an average of 57, r 
percent in 3 days. The control of acetone and tannic acid caused no 
mortality. 
An a s a t r i s t is ( De g . ) , the s qu ash h u g 
A dust of equal parts cf derris and hydrated lime had apparently 
no effect on the squash bu .-••". elsail et al, (53) in 1526. 
Davidson (17) in 15 30 reported that when rayed on the hiber- 
nating adults and nymphs on squash a suspension of rotenone in water 
at a concentration of 1 gm, to 250 cc. cf water hilled 10 percent and 
at one-half this concentration it hilled 5 percent. A dust made by 
mixing 2 parts of rotenone with 98 parts of diatomaceous earth killed 
less than 50 percent. 
