Control Efficacy of Biopesticide Bacillus thuringiensis G033A Combined with Reduced Low Dose Chemical Pesticides on Spodoptera frugiperda

doi:10.16409/j.cnki.2095-039x.2021.00.010

Abstract

Abstract: To improve the application efficiency of biological pesticides in the field and reduce the use of chemical pesticides, the laboratory bioassay and field trials for control of Spodoptera frugiperda were conducted through combination of Bacillus thuringiensis G033A and reduced dosages of chemical pesticides. It was showed that the corrected mortality rates of the 3^rd instar larvae were 99.07%, 87.04%, 85.19%, 80.56%; 20.37%, 11.11%, 6.48%, 1.85%; and 68.52%, 66.67%, 60.19%, 27.78%, respectively, after 24 h treated through 5% emamectin benzoate (0.2 g/L, 0.15 g/L, 0.1 g/L, 0.05 g/L), 200 g/L chlorantraniliprole (0.3 g/L, 0.225 g/L, 0.15 g/L, 0.075 g/L), 15% emamectin·chlorantraniliprole (0.3 g/L, 0.225 g/L, 0.15 g/L, 0.075 g/L). However, the mortality rates of larvae were 100.00%, 99.07%, 91.67% and 87.96%; 58.33%, 25.93%, 23.15% and 8.33%; 83.33%, 77.78%, 63.89% and 41.67%, when the 3 pesticides above were combined used with G033A (1.5 g/L), which were significantly higher than the pesticides used alone. Field experiments showed that after 15 days of combined application of reduced 25%, 50% dosage of emamectin benzoate and G033A, the control effects were 66.77% and 70.64%, respectively, which were significantly higher than the control effects of 44.43% of the reference dose used alone. The control effect of chlorantraniliprole, or emamectin·chlorantraniliprole combined with G033A for 5 and 15 days were higher than the reference dose of two chemical pesticides used alone. Field experiments showed that the combined use of G033A and reduced dosage of chemical pesticides could not only significantly improve the insecticidal activity of G033A, but also improve the efficacy of chemical pesticides and its quick efficacy. G033A (75 g) ＋5% emamectin benzoate (5 g), G033A (75 g) ＋200 g/L chlorantraniliprole (11.25 g), G033A (75 g) ＋15% emamectin·chlorantraniliprole (15 g), G033A (75 g) ＋15% emamectin·chlorantraniliprole (10 g) all have good control effect on Spodoptera frugiperda in field.

Key words: Bacillus thuringiensis G033A, chemical pesticides, reduced dose, Spodoptera frugiperda

CLC Number:

S476.1

HU Fei, XU Tingting, HU Benjin, BI Sijia, TONG Qiang, XU Lina, ZHANG Jie. Control Efficacy of Biopesticide Bacillus thuringiensis G033A Combined with Reduced Low Dose Chemical Pesticides on Spodoptera frugiperda[J]. Chinese Journal of Biological Control, 2021, 37(6): 1103-1110.

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