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Chinese Journal of Biological Control ›› 2022, Vol. 38 ›› Issue (1): 180-187.DOI: 10.16409/j.cnki.2095-039x.2021.05.020

• RESEARCH REPORTS • Previous Articles     Next Articles

Effects of Metarhizium anisopliae on the Fecundity of Nilaparvata lugens

KANG Kui1, CAI Youjun2, GONG Jun1, ZHANG Daowei1   

  1. 1. College of Biology and Agriculture, Zunyi Normal University/Laboratory of Regional Characteristic for Conservation and Utilization of Animal Resource in Chishui River Basin, Zunyi 563002, China;
    2. School of Life Sciences, Sun Yat-sen University/State Key Laboratory of Biocontrol, Guangzhou 510275, China
  • Received:2020-12-23 Online:2022-02-08 Published:2022-03-01

Abstract: The brown planthopper Nilaparvata lugens (Stål) is monophagous on rice and one of the important rice pests in Asia. The high fecundity is an important reason for its severe damage to rice. Metarhizium anisopliae is an environment-friendly insect pathogenic fungus widely used to control pests in recent years. It was determined in this study that 8×1010 spores/mL M. anisopliae suspension resulted in high mortality of the brown planthopper under both laboratory and field conditions, with corrected mortality and relative control efficacy of 55.67% and 63.81%, respectively. Compared with the control, egg deposition of the females infected with M. anisopliae was decreased by 38.37% in 16 days after mating, and egg hatching was decreased by 37.5%. The expression of Vg gene in 1-d old female brown planthoppers was as low as 32.26% of that in the control. The trehalose content dropped to 44.64% of that in the control. The results indicate that M. anisopliae not only has a high lethal effect on the brown planthopper, it can also reduce planthopper fecundity through influencing on the Vg expression and trehalose content.

Key words: brown planthopper, Metarhizium anisopliae, fecundity, biological control, agricultural pests

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