RESIDUES OF PIRIMIPHOS-METHYL AND PROTHIOFOS ON AND IN BROAD BEAN PLANT AND SOIL | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 8, Volume 78, Issue 2, July 2000, Page 595-604 PDF (2.51 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2000.321971 | ||||
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| Authors | ||||
| SHOKR A. A. SHOKR; MOHAMED A. EL-SAYED; MOHAMED E. A. HEGAZY; MOSTAFA M. ABU-ZAHW; NEVEIN S. AHMED | ||||
| Central Agricultural Pesticides Laboratory, Agricultural Research Centre, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| These studies were carried out to determine the residual behaviour of pirmiphosmethyl and prothiofos organophosphorus insecticides on green pods of broad bean plants and the contamination of soil under these plants. The residue half-life values (RL50) determined on green pods, peels and soil were ,15.6,15.6 and 144 hours for pirimiphosmethyl and 24, 316.8 and 120 hours for prothiofos. Prothiofos was more persistent in green pods and peels than piri-miphos-methyl, also prothiofos and pirimiphos-methyl were more stable in the soil than in the green pods. In green pods the maximum residues level (MRL) was 0.5 ppm for pirimiphosmethyl and the preharvest intervals (safety period) were 3 and 5.3 days for green pods and peels, respectively. Peeling the green pods removed most of the two insecticide resi-dues. For pirimiphos-n ethyl the residues were brought to a levet below the Codex MRL, so that the green seeds could be used safely at any time after spraying. The dry seeds were found to contain 0.009 ppm of prothiofos. On the contrary, no residues of pirimiphosmethyl were detected in dry seeds so, they could be marketed safely for human consumption at any lime after harvest. Also, dry peels and dry trellis contained 4.208 and 1.945 ppm of prothiofos and 0.033 and 0.057 ppm of pirimiphos-methyl, respectively. | ||||
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