Field Studies on Control of Onion Thrips in New York

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Abstract
Analyses of residues of DDT on onion bulbs from crops which had received field applications of dusts or sprays in amounts in excess of 5 1b. of the toxicant per acre showed residues of only 0.2 ppm. or less. In an expt. in which copper-containing fungicides were added to DDT dusts, it was found that these materials did not change the efficiency of DDT as a thrips poison. Neither addition of sulfur nor increasing of the DDT content to 10% improved the performance of dusts over that obtained with 5% dust. Fixed-wing plane and helicopter were both found to be efficient in distribution of dusts for thrips control. A dust containing 1.2% gamma isomer of benzene hexachloride was as effective as one of 5% DDT both as to thrips control and yields. DDT plus pyrethrum in an aerosol formulation was as good as a 5% DDT dust.

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