Fate of [14C/3H]emamectin benzoate in cabbage. 1. Extractable residues.

摘要

Cabbages, after treatment with 8 weekly applications of avermectin at a 0.015 lb or 0.075 lb a.i./acre, were collected at preharvest intervals of 2 h to 10 days. For foliage at these intervals, the total 14C-residue declined from 450 to 200 or 2900to 1300 p.p.b. for the 2 doses, resp. The total 14C-residue was 78-92% extractable and the extractable residues consisted of the parent as well as polar and avermectin-like residues. The parent declined from 90 to 7 p.p.b. and polar residues ranged from120-170 p.p.b. For the extractable residue: 10 avermectin-like residues were identified with the parent accounting for 4-38% of the total; the polar residues were found to be extremely complex, consisting of many minor components and no apparent conjugates; and the polar residues accounted for 23-75% of the total.