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- Author or Editor: William O. Gauer x
- HortScience x
Residues of dimethyl-2,3,5,6-tetrachloroterephthalate (DCPA), monomethyl-2,3,5, 6-tetrachloroterephthalate (MTP), 2,3,5,6-tetrachloroterephthalic acid (TPA) and hexachlorobenzene (HCB) were determined in tops and roots of radish (Raphanus sativus L.) to which the herbicide had been applied as a soil treatment for preemergence control of weeds under commercial field conditions. Residues of these compounds in the radish roots were either negligible or less than the analytical method sensitivity (0.01 ppm for all compounds except HCB which was 0.001 ppm). Much more residues of DCPA were found in the radish tops ranging from about 2 to 13 ppm. Residues of the other compounds were higher in the tops, in all instances, than in the roots. Recoveries of all the chemicals in fortified controls ranged from 70 to 100%.
Pistachio (Pistacia vera L.) pericarp, shell and kernel were analyzed for levels of azinphos-methyl and its oxygen analog 21 days after application of 227 g (0.56 kg/ha) and 454 g (1.12 kg/ha) active ingredient/379 liters (100 gal) applied at the rate of 1136 liters (300 gal)/0.405 ha with an airblast sprayer. Levels of chemical ranged from 0.8 to 11.6 ppm in the pericarp and only negligible levels were detected in the shell and kernel. Hull split ranged from 4.4 to 17.2%. Method sensitivity was 0.1 ppm and recoveries ranged from 80 to 100%.