Abstract:

In order to evaluate the safety of eight pesticides, including procymidone, chlorpyrifos, eta-cyfluthrin, cypermethrin, iprodione, acetamiprid, phoxim and avermectin, on Allium tuberosum Rottler ex Sprengle, the recommended dosage of the eight pesticides and the actual dosage used by farmers were applied. Samples from different intervals were collected for pesticide residue analysis. The experimental results showed that the detection values of chlorpyrifos were 0.100 0 and 0.200 0 mg·kg^-1, respectively, until 30 days after treatment, still exceeding the maximum limit of 0.02 mg·kg^-1. The conventional treatment A of procymidone degraded to 4.450 mg·kg^-1 until 7 days after treatment, meeting the limit requirements; Treatment B did not degrade to 3.540 0 mg·kg^-1 until 21 days after treatment, meeting the limit requirements. The conventional treatment A of the other six pesticides all degraded to the maximum limit within 7 days after treatment, among which the residual levels of eta-cyfluthrin, iprodione, and acetamiprid meet the limit requirements after 2 hours of treatment, and can be used with confidence; The residual levels of cypermethrin and avermectin after 3 days of treatment and phoxim after 7 days of treatment meet the limit requirements. The residual amount of cypermethrin in treatment B, which is 1.2 times of the conventional dosage, is delayed until 10 days after treatment to meet the limit requirements.

Key words: Allium tuberosum Rottler ex Sprengle, pesticide residue, quality and safety