Abstract
An analytical procedure for determining residues of Bayer 39007 in plant materials is described. After the residues were partially purified, they were hydrolyzed with methanolic sodium hydroxide and the products of hydrolysis were reacted with the color-forming reagent p -nitrobenzenediazonium fluoborate. Two applications of Bayer 39007 granules at 2.76 kg actual toxicant per hectare per application in 20-cm bands over the tops of small sugar beet plants left 0.43, 0.15, and 0.05 ppm in sugar beet foliage 55, 90, and 117 days after the second application. The treatment was phytotoxic and the plants remained yellow for 6 weeks. Sugar beet roots and crowns had 0.02 ppm Bayer 39007, 117 days after the 2nd application. Potato tubers had 0.18 ppm Bayer 39007 residue 86 days after banding with 10% Bayer 39007 granules at 2.24 kg actual toxicant per hectare. Bayer 39007 did not give satisfactory control of the green peach aphid, Myzus persicae (Sulzer), when used as seed, soil, or foliage treatments all potato or a foliage treatment on sugar beets.
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