Four Biological Pesticides for Insect Pest Management of Litchi Fall Shoots

doi:10.16409/j.cnki.2095-039x.2019.02.005

Abstract

Abstract: The control efficiency of three Bt (Bacillus thuringiensis) pesticides and one Beauveria bassiana against lepidopteran pests occurring on litchi fall shoots was evaluated, with 20% of diflubenzuron diluted to 1500 times as a chemical pesticide control and water as a blank control. Our results showed that spraying of Bt B diluted at 2000 and 1500, and Bt C diluted at 1000 times exhibited higher control efficiency in comparison with other biopesticide treatments. Three days after spraying, the pest population was reduced by 77.98%, 69.45% and 59.32% by the three Bt treatments, respectively, which contrasted to the 50.58% control efficiency in the chemical pesticide control. At 7 days after spraying, the pest population was decreased by 86.87%, 78.67% and 79.58% with the three Bt treatments, which were not significantly different from that in the chemical pesticide control (91.82%). The damage indexes of the mature leaves in the three Bt treatments were much lower than that of the blank control, and percentages of damaged leaves were not different between the Bt treatments and the blank control. Compared with B. bassiana, Bt pesticides exhibited quick pest control and more stable efficiency in face of environmental stress. Based on the above results, we recommend using Bt B and Bt C instead of diflubenzuron to control lepidopteran pests of the litchi fall shoots with proper concentrations and timing.

Key words: biological pesticides, litchi fall shoots, Bacillus thuringiensis, Beauveria bassiana

CLC Number:

S476.1

GUO Yi, ZHAO Can, ZHENG Yuan, WANG Chengxing, LI Junzhai, LI Dunsong. Four Biological Pesticides for Insect Pest Management of Litchi Fall Shoots[J]. journal1, 2019, 35(2): 185-190.

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