-65- 
Orius triaticolor (nhite) 
DDT signifioantly reduoed the number of flower bugs on potatoes 
in western Nebraska*— Tate et al. ( 542) ■ 
DDT was applied as a 5-percent dust in pyrophyllite and as a spray 
containing 4 pounds of 10 percent DDT in pyrophyllite per 100 gallons 
of water in field tests in Nebraska during 1944* Populations of certain 
beneficial inseots, suoh as Orlus spp. were found to be significantly 
reduced by the DDT dust or Spray. The adverse ef feot of DDT on predatory 
species seems to be minimised by the fact that this material also con- 
trols the major potato pests found in this state. DDT had no injurious 
eff eot on potato plants at the strengths used.— Hill (209 ) • 
Cimicidae 
Cimex lectularius L., the bedbug 
A kerosene spray containing 5 percent of DDT is remarkably effec- 
tive against bedbugs. Mattresses, pillows, springs, and bedframes should 
be lightly sprayed so that the surface is barely moistened. The advan- 
tage of this treatment over fumigation is that reinfestations are elimi- 
nated for several months, whereas fumigation kills only the bugs present 
at the moment.— Freeborn (160) . 
A severe and long-standing infestation of bedbugs in the animal 
rooms of a biologioal res ear oh institution in Toronto was reported elimi- 
nated by dipping the cages in a 5-peroent solution of DDT in refined kero- 
sene, using benzene as an auxiliary solvent •-•Ross (306) . 
At the ninth annual Pest Control Operator's conference held at Purdue 
University January 16-19, 1945, the results of a demonstration of DDT on 
bedbugs were tabulated and a 100 percent kill observed.— Anon. (2, 15) • 
The le-ttial dose of pure DDT for Cimex was about 10 mg. per square 
centimeter.— Buxton (100) . 
A 20-percent IDT dust and 3 percent of DDT in kerosene spray gave 
excellent control.— N. J. Agr. Expt. Sta. (2 75 ) . 
DDT is a contact poison.— Domenjoz ( 13 5 ) . 
A bedbug exposed to filter paper bearing a deposit of DDT was found 
dead the next day.— Vargas et al. (360 ) . 
Kaolin containing 1 percent of DDT was dusted on sheets of paper on 
which the inseots were separately placed and covered with a beaker. The 
time to total paralysis was 340-380 minutes and to death 940-980 minutes. — Sen 
(311). 
