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Chinese Journal of Biological Control ›› 2023, Vol. 39 ›› Issue (4): 760-766.DOI: 10.16409/j.cnki.2095-039x.2023.01.008

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Control Effect of Trichogramma chilonis carrying Beauveria bassiana on Soybean Podborer

ZHAO Yu1, LIU Jia2, LU Yang1, SUI Li1, XU Wenjing1, DU Qian1, LI Qiyun1, ZHANG Zhengkun1   

  1. 1. Institute of Plant Protection, Jilin Academy of Agricultural Science/Jilin Key Laboratory of Agricultural Microbiology/Key Laboratory of Integrated Pest Management on Crops in Northeast China, Ministry of Agriculture and Rural Affairs, Gongzhuling 136100, China;
    2. Institute of Soybean Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China
  • Received:2022-05-21 Online:2023-08-25 Published:2023-08-25

Abstract: Soybean moth is an important pest causing huge economic loss in the main soybean producing areas in China. Beauveria bassiana and Trichogramma are the two important biological control agents against soybean moth. However, how to combine the two agents to realize sustainable control of soybean moth is not addressed. Herein, three B. bassiana strains with high virulence against the pest were isolated, identified and screened from the diseased soybean moth larvae. The median lethal time (LT50) of the strains to the mature larvae of the pest were 6.21 days, 6.39 days and 6.87 days, respectively. The B. bassiana conidia and their highly adsorptive adjunct, 0.1% (w/v) starch solution, showed no effect on the emergence and parasitism of pest eggs of T. chilonis. With the adjunct, T. chilonis was able to carry fungal conidia of 3.56×104 per wasp. The two-year field experiments showed that, compared with Trichogramma alone, the pest control effect of Trichogramma carrying B. bassiana was increased by 11.80% and 8.31%, respectively, to 70.44% and 64.75%, respectively, thereby improving the pest control efficiency and realizing synergy without increasing the control cost.

Key words: Leguminivora glycinivorella, biocontrol microorganism, natural enemy, synergy

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