Ethylene Dichloride Treatments for the Immature Stages of the Japanese Beetle

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Abstract
Ethylene di-chloride in the form of an emulsion prepd. from an emulsible mixture of this compound is an effective insecticide for the immature stages of the Japanese beetle. Immersion of balled or potted plant balls as large as 10 inches in diam., for 10 seconds, in an emulsion prepd. at the rate of 1 gallon of the emulsible mixture to 100 gal. of water, resulted in mortality of all larvae. Most of the pupae and at least 1/3 of the eggs were also killed by this treatment. Variable factors such as temp., moisture, ball wrapping, and soil type, within the range normally encountered in nurseries, were not limiting factors. On the basis of this evidence, the treatment has been authorized by the U. S. Dept. of Agric. as a quarantine measure for the treatment of balled and potted plants infested with Japanese beetle larvae. Application of the above emulsion at the rate of 2 gal. per sq. yard to the surface of the soil about the roots of plants growing in beds or to turf killed all the larvae and a high % of pupae. Applications to turf of 1/2 this quantity of emulsion were highly effective. Injury to plant growth by these treatments was negligible. As a fumigant in an enclosed chamber the vapors of an ethylene dichloride-CCl4 mixture gave promising results in prelim. trials at temps. above 60[degree]F.

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