Studies on the Insecticidal ProPerties of Benfuracarb as a Soil Treatment

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The insecticidal properties of the carbamate insecticide benfuracarb were investigated. Benfuracarb, a sulfenylated derivative of carbofuran, proved to be a highly effective soil insecticide against a wide range of agricultural pests when applied as granules or as an emulsifiable concentrate. Under these conditions it was more effective (on a molar basis) than carbofuran. Studies on the superior efficacy of benfuracarb were conducted using the small brown planthopper Laodelphax striatellus as a test insect. Benfuracarb was as effective as carbofuran by soil treatment in the closed system where no movement or loss of active ingredient in the soil occurred. Successive mobility studies in the soil indicated that the active ingredient in the benfuracarb-treated soil was either mostly or completely immobile, and was retained for a longer period than was carbofuran. These properties of benfuracarb, combined with its excellent systemic action, probably lead to a higher ratio of absorption of the active ingredient than from carbofuran, thereby accounting for its higher insecticidal activity when applied to soil.