Residue behavior and efficacy of benzothiazole in grains under different fumigation conditions.

Abstract

Benzothiazole was a potential grain fumigant for Tribolium castaneum. However, its safety profile and suitable fumigation conditions remain unknown. Therefore, we investigated the insecticidal efficacy, accumulation and dissipation of benzothiazole in grains (wheat, corn and rice) under different temperatures. WE ESTABLISHED A UNIVERSAL DETECTION METHOD (MODIFIED QUECHERS COUPLED WITH GC-MS/MS) OF BENZOTHIAZOLE RESIDUES IN THREE GRAINS, WHICH PROVIDING HIGH LINEARITY (R2 > 0.999), SENSITIVITY (LODS= 0.001 MG/KG, LOQS=0.002-0.005 MG/KG), ACCURACY (RECOVERIES = 88.18-118.75%) AND PRECISION (RSDS < 4.78%). THE INSECTICIDAL EFFICACY ORDER OF BENZOTHIAZOLE WAS 30 °C ≥ 10 °C > 20°C AND CORN > WHEAT > RICE. TEMPERATURE POSITIVELY AFFECTED THE ACCUMULATION/DISSIPATION RATE OF BENZOTHIAZOLE. RICE WAS THE MOST EASILY ACCUMULATED AND DISSIPATED GRAIN FOR BENZOTHIAZOLE RESIDUES, WHILE CORN ACCUMULATED BENZOTHIAZOLE MORE THAN WHEAT BUT LESS THAN RICE, WITH DISSIPATION SLOWER THAN WHEAT AND RICE.: CONCLUSION: Our results provide important references for the application of benzothiazole and even other fumigants. This article is protected by copyright. All rights reserved.