Organophosphate Residues in Grasshoppers from Sprayed Rangelands |
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Authors: | K L Stromborg L C McEwen T Lamont |
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Institution: |
a U.S. Fish and Wildlife Service, Patuxent Wildlife Research Center, Laurel, Maryland
b U.S. Fish and Wildlife Service, Patuxent Wildlife Research Center, Fort Collins, Colorado |
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Abstract: | Grasshoppers (Orthoptera) were collected in pastures that had been sprayed with malathion and acephate to estimate the secondary exposure of insectivorous birds to those pesticides. Residues of malathion were below 3 ppm at 30 and 54 hours after spraying and no malaoxon was detected. In contrast, acephate was found at 8 and 9 ppm 4 hours after spray; 3-5 ppm of the toxic metabolite methamidophos were also detected at that time. By 53 hours postspray, acephate levels declined to 2 ppm and methamidophos to less than 1 ppm. These results suggest that although malathion may not be a hazard to insectivorous species, acephate may be hazardous through metabolic transformation to methamidophos. |
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