| Autor: |
Szeto, S.Y.1, Mackenzie, J.R.1, Brown, M.J.1 |
| Zdroj: |
Journal of Environmental Science & Health. Part B. Pesticides, Food Contaminants & Agricultural Wastes. Jan1984, Vol. 19 Issue 2, p225-235. 11p. |
| Abstrakt: |
Foliar sprays of dimethoate at 150 or 300 g a.i./ha, methamidophos at 450 or 900 g a.i./ha and pirimicarb at 140 or 280 g a.i./ha were applied for control of the green peach aphid, Myzus pericae (Sulzer), and the lettuce aphid, Nasonovia ribisnigri (Mosley), about 2 weeks before the lettuce started heading, and again about 1 week from harvest. In lettuce, dimethoate partially oxidized to its oxon and pirimicarb converted to its methylamino‐ and/or formyl methylamino‐analogues. Most residues were present in the outer leaves which were exposed directly to the sprays; only traces of residues were detected in samples of the inner head leaves. Total residues disappeared rapidly. Pirimicarb was the least persistent and only traces of residues (<0.01 ppm) were detected in marketable heads. Concentrations of dimethoate, including the oxon and of methamidophos were well below their respective tolerances of 2 and 1 ppra respectively. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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