EFFECT OF SOIL APPLICATIONS OF INSECTICIDES 19 



was a trend toward lower yields of Fordhook lima beans, celery, 

 and carrots. After three annual applications of this insecticide, 

 the yield of potatoes was reduced substantially below that of the 

 check plots. The yield of onions was also reduced following the 

 third application of ethylene dibromide, but this was due pri- 

 marily to the discarding of much of the crop because of f usarium 

 rot. 



Chemical analyses of the soil indicated that approximately 45 

 percent of the toxaphene remained in the soil a year after the 

 second application. No significant amounts of toxaphene were 

 present in lima beans, sweetpotatoes, or potatoes grown in soils 

 treated with this insecticide. No residues of aldrin were found in 

 either soils, potatoes, or lima beans after applications of 4 pounds 

 of aldrin per acre. 



A panel of experienced tasters in 1951 were unable to detect 

 any off-flavor in green lima beans or in tomatoes grown in soils 

 treated with aldrin, chlordane, and toxaphene, but they found 

 potatoes to be significantly off-flavor. 



LITERATURE CITED 



(1) Allen, N., Bondy, F. F., Bullock, J. F., and Hall, E. E. 



1951. EFFECT OF SOIL TREATMENTS WITH DDT, BENZENE HEXACHLORIDE 

 AND TOXAPHENE ON TOBACCO, COTTON, AND COWPEAS. U. S. 



Dept. Agr. Tech. Bui. 1047, 22 pp., illus. 



(2) Danish, A. A., and Lidov, R. E. 



1950. COLORIMETRIC METHOD FOR ESTIMATING SMALL AMOUNTS OF 



aldrin. Analyt. Chem. 22: 702. 



(3) Foster, Arthur C. 



1951. some plant responses to certain insecticides in the soil. 



U. S. Dept. Agr. Cir. 862, 41 pp., illus. 



(4) Gould, E., and Hamstead, E. 0. 



1951. the toxicity of cumulative spray residues in soil. Jour. 

 Econ. Ent. 44: 713-717. 



(5) SlMKOVER, H. G., AND SHENEFELT, R. D. 



1951. EFFECT OF BENZENE HEXACHLORIDE AND CHLORDANE ON CERTAIN 



soil organisms. Jour. Econ. Ent. 44: 426-427. 



(6) Tied jens, Victor A. 



1952. soil use of insecticides. Agr. Chem. 7 (3) : 45-47, 118-120. 



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