- 12 - 
butoxide, 20 percent Freon-12, 66 percent methylene chloride, and enough 
carbon dioxide to develop 150 pounds per square inch pressure proved one 
of the "best when sprayed on aluminum and masonite panels and tested for 
residual toxicity against confused flour beetles, American roach adult6 
and nymphs, and grasshoppers. — Fulton et aj.. ( l60 ) , 
No aerosol formulas containing chlordane have "been approved by the 
U. S. Department of Agriculture. 
Proprietary insecticides that contain chlordane - The Arizona Agri- 
cultural Experiment Station (2Jj) in 19^8 listed 1C04 products registered 
"by 101 registrants in that state. Analyses are given of 6 chlordane 
formulations. 
Frear e_t al,. ( 156 ) in 19*+9 published a list of active ingredients in 
trade-marked pest control materials which includes about kO products that 
contain chlordane. 
EFFECT ON PLANTS 
When added to the soil - When chlordane was added to Chester clay 
loam, Sassafras sandy loam, Eveshoro fine 3and and muck in the greenhouse, 
it depressed plant growth at relatively low levels without causing any 
obvious symptoms. Soil type and character, especially the quantity of 
organic material or colloidal clay present, are important factors in de- 
termining the toxicity of organic insecticides. Chlordane injures root 
systems more than DDT does and is more toxic to seedling plants than 
benzene hexachloride. Chlordane at the rate of 25 pounds per acre severely 
affected the germination of seeds. — Cullinan (22., 9^0 « 
When chlordane was added to the soil, it appeared to be toxic to all 
vegetable crops tested. — Foster (151 ) . 
Chlordane was mixed with Sassafras sandy loam by atomizing an ace- 
tone solution onto the soil particles while mixing at rates up to ^00 
pounds per acre (based upon 6 2/3-inch profile or 2,000,000 pounds of 
soil). The treated soil was distributed in 8-inch pots and each pot was 
planted to three 1-year-old Blakemore strawberry plants. Chlordane did 
not have any deleterious effect on the growth of the plants. — Goldsworthy 
(181). 
Snap beans from plots treated with 297 pounds of chlordane 50-per- 
cent wettable powder per acre had a disagreeable odor when steamed in 
cotton-plugged flasks. About four months after treatment of the soil, 
cowpeas were planted after the beans and okra were removed. The vigor 
of the plants was much better than in untreated soil and these differ- 
ences were not the result of root-knot which was quite severe OB prac- 
tically all the plots.— Ellis and Claytcn (17?) . 
At Corvallis, Oregon, in 19^7, a 5-percent chlorcane-talc dust at the 
rate of 27.5 pounds of toxicant per acre applied to the soil with a fer- 
