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Residue analysis of several pesticides in asparagus

Residue analysis of several pesticides in asparagus

Plant Protection Bulletin (Taichung) 21(3): 277-284

In separate experiments diazinon, methyl parathion, mevinphos and neo-asozin were applied 1 time and 4 times at weekly intervals to asparagus grown in the fields. The leaves and spears of the treated asparagus were subsequently analyzed for the parent compounds and their oxidation metabolites from the final day for pesticide application on through 21 days later. Three organo-phosphate compounds were analyzed by GLC. Methyl parathion residues on spears had decayed to < 10% of their original levels after 3 days, while the leaves contained residues averaging 0.09 ppm after 15 days. Mevinphos decayed to 0.065 ppm within 1 day (tolerance level 0.75 ppm). Based on these residue measurements and the respective tolerance levels for the pesticides, it is recommended that applications of methyl parathion and mevinphos be ceased 3 days and 1 day prior to harvest, respectively. Asparagus can absorb and accumulate As from treated leaves and soil after application of neoasozin. The highest As concentration by absorption spectroscopy was far below the 2.6 ppm tolerance level.

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Accession: 000969589

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