Metabolic Fate of Insecticide Pyraclofos in Cabbage Plants

TASHIRO Shigeki, YAMAMOTO Akihiro, SUGITA Norio, OKADA Yoshiyuki

doi:10.1584/jpestics.20.463

Metabolic fate of pyraclofos, 1-(4-chlorophenyl) pyrazol-4-yl ethyl S-propyl phosphorothiolate (Voltage), in cabbage plants was studied under laboratory conditions using ¹⁴C-pyraclofos labeled at the benzene ring. When ¹⁴C-pyraclofos was applied to the leaf surface of the plants at the rate of 2μg/cm², pyraclofos disappeared from the treated leaf with a half-life of approximately one week. Thirty days after foliar application, most of ¹⁴C-radioactive carbon (¹⁴C) was found in the treated site of the leaves, however, ¹⁴C translocated to the nontreated portions was a small extent. Major metabolic pathways of pyraclofos in cabbage leaves were cleavage of P-O-aryl bond to yield 1-(4-chlorophenyl)-4-hydroxypyrazole, and followed by conjugation with sugars such as glucopyranoside or malonylglucopyranoside. A small amount of the parent compound was detected in the treated site, but not in the nontreated portions of the leaves. When cabbage plants were cultivated for 30 days using soils treated with ¹⁴C-pyraclofos at the rate of 10ppm, most of the ¹⁴C was found in the treated soil. A small amount of ¹⁴C was translocated to the plants, and most of it was in the roots. On the other hand, ¹⁴C detected from the edible portion, leaf and stem was very small extent, and no parent compound was determined.

Metabolic Fate of Insecticide Pyraclofos in Cabbage Plants

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