DDT Aerosols for Pea Aphid Control1

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Abstract
In one season''s work DDT, ap-plied by the liquefied-gas aerosol method, was highly effective against the pea aphid on alfalfa and on Alaska and wrinkled peas. DDT applied in this manner was rapid in action and gave a kill of aphids equal or superior to standard sprays of ground derris root or sprays of an aqueous suspension of DDT. Aerosols of derris resins did not give favorable results; the nicotine aerosols, though giving fair kills, caused injury to alfalfa and pea plants. About 5% of DDT appears to be the opt. cone, for use-against the pea aphid, and good results were obtained with several combinations of the solvents cyclohexanone, lubricating oil, and acetone, with 50% of methyl chloride_as propellent. DDT aerosol treatment compares favorably in cost with standard treatments and in addition is applied with simply constructed, inexpensive equipment.

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