Absorption and Translocation of Diazinon and Stauffer N-2790 in Sugar Beet Seedlings12

Abstract

In 2 field tests, 28 lb per acre of 14.3% diazinon granules and 100 lb per acre of 4% Stauffer N-2790 ( O -ethyl S -phenyl ethylphosphonodithioate) granules were broadcast and worked into the soil before planting of sugar beets. Subsequent infestation of the spinach leaf miner, Pegomya hyoscyami (Panzer), were significantly lower in treated than in untreated plots. Sugar beets were grown in similarly treated soil in a Greenhouse where precautions were taken to prevent contamination of foliage. Leaves from 32-day-old seedlings were analyzed chemically by gas chromatographic techniques. Residues of 0.32 ppm of diazinon and 0.048 ppm of Stauffer N-2790 were recovered. Both insecticides had therefore been absorbed and trans located by the plant, thus rendering untreated tissues insecticidal.