Chemical Control of the Springtail Onychiurus pseudarmatus (Collembola: Onychiuridae)

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Abstract
Onychiurus pseudarmatus Folsom attacks germinating seeds and seedling roots of several crops in western Washington. Insecticides were tested as soil treatments against this collembolan in the laboratory; selected ones were field-tested as seed treatments and as at-planting seed-furrow treatments on spinach grown for seed. Ten of 19 insecticides tested had LC50’s of 50 ppm or less following a I-week exposure period to treated soil. O. pseudarmatus was most susceptible to the carbamate insecticides carbofuran, thiofanox, aldicarb, and methiocarb, and to the organophosphorus insecticides terbofos, phorate, and disulfoton, each of which contains a sulfide in the carhon chain of the acid moiety. For these compounds, LC50’s were 1.23–3.92 ppm and Lc90’s were 2.87–11.8 ppm. In field tests, spinach seed-furrow applications of granular carbofuran at 7, 14, 28, and 56 g (AI)/300 m of row reduced springtail populations and increased plant stands and seed yields compared with untreated controls. Seed treatments with carbofuran and methiocarb did not provide adequate protection of spinach from springtail feeding in a field trial.

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