Insecticidal Aerosols for Pea Aphid Control—Second Report1

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Abstract
Aerosols containing 5% of DDT in various formulas were applied to about 100 acres of Alaska and vars. of wrinkled peas with a dispenser designed for commercial use that was mounted on a jeep. Treatments with dosages of 0.5 lb. of DDT per acre at speeds of 3-5 miles per hr. were more uniformly effective than higher speeds and lower dosages. Nozzles having an output of 3 gal. per hr. were comparable to the previously used 2-gal.-per-hr. nozzles. Successful treatments were made during varying weather conditions, including temps. between 54[degree] and 84[degree]F, wind velocities up to 20 miles per hr., and in sunshine as well as rain. Treatments resulted in 97-99% reduction of the aphids and in yield increases of 10-67% where the infestations were heavy. Better control of aphids and greater increase in yield of peas were obtained on Alaska peas than on wrinkled vars., but this may have been due in part to differences in vigor of the infestations. Nozzle stoppage due to corrosion particles or formation of crystals was largely corrected by including a methylated naphthalene in the soln., adding 1% of propylene oxide to combine with any free acids, and installing a filter in the line.

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