- 71 - 
As a space spray chlordane is slightly more effective than DDT against 
house flies, hut less toxic to yellow-fever mosquitoes. Chlordane, like 
DDT, is slow in its effect on insects. When compared on the "basis of speed 
of kill, DDT was more rapid against mosquitoes. When evaluated from the 
standpoint of residual action against house flies, chlordane in dosages of 
50 to 100 mg. per square foot of surface remained effective for 9 and 24 
weeks, respectively, when the flies were exposed for 2 hours. Similar re- 
sults were ohtained with yellow-fever mosquitoes. In field tests in 
Florida, when applied by airplane or with ground equipment, DDT was more 
effective than chlordane in killing mosquitoes present at the time of 
treatment, and also exhibited longer residual effects. — Knipling. — Knipling 
( 26k . 265 ). 
A single dose of chlordane was administered orally to rabbits at a 
dosage of 300 mg. per kg. When undiluted chlordane in a gelatin capsule 
was fed the animal, the mortality of mosquitoes feeding on the rabbit was 
4 percent after 1/4- day. When administered as a 10-percent solution in 
corn oil (5 mg./kg.) through a stomach tube, the mortality of mosquitoes 
was 99 percent after 4 days, but the rabbit died. — Knipling e_t al,. ( 266 ). 
Aedes communis (Deg. ) 
A series of laboratory tests with various insecticides were made on 
fourth-instar mosquito larvae collected in mountain areas in Oregon. 
Identification of the several lots used showed 93 percent Aedes communis t 
6 percent A. hexodontus . and 1 percent Aede s sp. The temperature ranged 
from 50° to 60° P. in the various tests. DDT, added as an acetone solu- 
tion to 1 part in 600 million parts of water, killed about 85 percent of 
the larvae in 48 hours. DDT and gamma-BHC were about equally toxic, and 
toxaphene, chlordane, and methoxychlor were somewhat less effective. — 
Roth^et al. ( 400) . 
Aedes sollicitans (Wlk.), the salt-marsh mosquito 
Chlordane sprays applied both from airplanes and with ground equipment 
proved inferior to DDT as a larvicide.— Fluno ejb al. (150): Knipling (264.) . 
Chlordane in fuel oil solution, applied by hand equipment in the fall 
of 1947 in Alaska at 1 pound per acre, gave 66 percent control of Aedes 
mosquitoes. — Travis et al. ( 459 ) » 
The effectiveness of prehatching treatments for the control of arctic 
mosquitoes was studied in 1947 and 1948 at Churchill, Manitoba, Canada. 
These treatments were applied before the spring thaw to snow and ice cover- 
ing potential breeding areas. DDT, in a wettable powder (50 percent) and 
an emulsion, gave complete control of larvae at 0»1 pound per acre. Chlor- 
dane and methoxychlor were slightly and toxaphene considerably less effec- 
tive than DDT.—McDuffie e_t al ( 30? ). 
Aedes taeniorhvnchus (Wied.) 
Same as for A. sollicitans . — Fluno e_b al. ( 150 ). 
