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- Author or Editor: Thomas E. Archer x
Abstract
Residues of 2,2-dichlorovinyl dimethyl phosphate (dichlorvos) on Calimyrna figs (Ficus carica L.) declined to <5 ppb by day 6 after trees were pressure sprayed with 2,805 liters/ha at a rate of 2.24 kg Vaponite 2 a.i./ha for control of dried fruit beetle (Carpophilus hemipterus L.) and Drosophila spp. and fruit were sampled at 0, 1, 2, 4, 6 and 10 days. Very little residue (<5 to 33 ppb) was detected on fresh figs after multiple applications of 2.24 and 4.48 kg a.i./ha. All of the ground dried figs had significant residues. About 90.9% of the residues were removed after dehydration. Dichlorvos residues were on the surface of the figs but were not easily removed by surface wash only. Residues were absorbed in the surface cuticle materials of the figs and surface waxes must be dissolved to successfully remove the residues from the plant material.
Abstract
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%.
Abstract
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%.