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Calliphoridae 
Callitrora americana, (C. & P.), the screw-worm 
Chlordane is among the most effective insecticides tested against 
screw-worm larvae. — U. S. Bur. Ent. amd Plant Q,uar. ( 4-68 ) . 
Callitroga macellaria (F»), the seccndary ecrew-worn 
Phormja regina (Meig.), the "black "blow fly 
At Kerrville, Texas, in 19^-7 sheep were infested "by implanting the newly 
hatched larvae of several "blow flies, principally these species on a very 
small piece of ground beef which had "been rubbed into the wool on the 
animal's rump. On either the second or third day after implantation, de- 
pending on weather conditions and the development of the larvae, the in- 
festation was treated. Each of the chemicals was used at a concentration 
of 2 percent. Chlordane and the gamin isomer of benzene hexachloride (83 
percent pure) protected sheep against reinfestation for relatively long 
periods of time, but in these tests neither remained effective as long as 
toxaphene. — Graham and Eddy ( 193 ). 
Phormia spp. 
Chlordane is effective in protecting sheep from fleece wcrr. attack. — 
Bishopp and Enipling C&)l Laake (280) ; U. S. Bur. Ent . and Plant ^uar. (465). 
Cecldomyiidae 
Phytophaga destructor , (Say), the hessian fly 
Chlordane dust was applied by airplane in September 19^7 to Colorado 
wheat fields. This gave some control. Because of winds airplane dusting 
is not the proper means of application. — Colo. Div. Agr. ( 78) . 
Culicidae 
Aedes ae^ypti (L.), the yellow-fever mosquito 
A dilution of 0.2 p. p.m. cklordane in water killed 100 percent of the 
larvae in 48 hours; 0.063 p. p.m. killed 50 percent. DDT was more toxic, 
0.C5 p. p.m. killed 100 percent and 0.014 killed 50 percent. — G-insburg (l?5). 
Insects confined in a small screen-wire cage were exposed for 10 
seconds in a 100-cubic foot cabinet in which chlordane dissolved in cyclo- 
nexanone had been sprayed 20 seconds previously. A 5-percent concentration 
of chlordane gave 15 percent knockdov/n in 30 minutes and 99 percent mortal- 
ity in 24 hours. The calculated concentration giving °0 percent mortality 
was: gamma benzene hexachloride 0.4; DDT l.C; chlordane 3: and toxaphene 
27. Vhen tested as residues on plywood surfaces at dosages of 50, 100, 
200, and 400 ng. per square foot, DDT was the only one of these four coro- 
poiinds stil] cau3ing high mortality of mosquitoes at the ond of ?6 weeks 
at all do cares. — Gakan e_t aj... ( 1 62 ) . 
