Effectiveness of DDT in the Control of Ticks on Vegetation

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Abstract
Preliminary tests indicated that kerosene, mineral oil, and castor oil were inferior to benzene, pine oil, and zylene as solvents for DDT used to control ticks on vegetation. Using the lone star tick, Amblyomma americanum, and the black-legged tick, Ixodes ricinus scapularis, as test insects, emulsions of DDT in pine oil using Areskap 50 or B-1956 (a phthalic glyceryl alkyd resin) as the emulsifier were superior to those using other solvents or emulsifiers. In tests against the black-legged tick along roadsides, 0.1% DDT emulsions were at least as effective as a nicotine sulfate-NaF spray and dusts containing 1 and 0.5% DDT were as effective as derris dusts or sprays. Dusts containing 0.1% DDT were less effective than stronger ones. By 21-22 days after application, a 0.1% DDT spray was far more effective than the nicotine sulfate-NaF spray or a 1% DDT dust.

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