Synergistic effects of the entomopathogenic fungus Isaria javanica and low doses of dinotefuran on the efficient control of the rice pest Sogatella furcifera

文献类型： 外文期刊

第一作者： Zhou, Tingting

作者： Zhou, Tingting;Zhao, Qian;Li, Chengzhou;Ye, Lu;Huang, Zhen;Li, Yanfang;Keyhani, Nemat O.

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关键词： Isaria javanica; Sogatella furcifera; entomopathogenic fungus; white planthopper; rice; synergistic effect on pest control

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：4.8； 五年影响因子：4.8 ）

ISSN： 2095-3119

年卷期： 2024 年 23 卷 2 期

页码：

收录情况： SCI

摘要： The rice planthopper, Sogatella furcifera, is a piercing -sucking insect pest of rice, Oryza sativa. It is responsible for significant crop yield losses, and has developed moderate to high resistance to several commonly used chemical insecticides. We investigated the effects of the insect fungal pathogen Isaria javanica, alone and in combination with the chemical insecticide dinotefuran, on S. furcifera under both laboratory and field conditions. Our results show that I. javanica displays high infection efficiency and mortality for different stages of S. furcifera, reducing adult survival, female oviposition and ovary development. Laboratory bioassays showed that the combined use of I. javanica with a low dose (4-16 mg L-1) of dinotefuran resulted in higher mortality in S. furcifera than the use of I. javanica or dinotefuran alone. The combined treatment also had more significant effects on several host enzymes, including superoxide dismutase, catalase, peroxidase, and prophenol oxidase activities. In field trials, I. javanica effectively suppressed populations of rice planthoppers to low levels (22-64% of the level in untreated plots). Additional field experiments showed synergistic effects, i.e., enhanced efficiency, for the control of S. furcifera populations using the combination of a low dose of I. javanica (1x10(4) conidia mL(-1)) and a low dose of dinotefuran (similar to 4.8-19.2% of normal field use levels), with control effects of >90% and a population level under 50 insects per 100 hills at 3-14 days posttreatment. Our findings indicate that the entomogenous fungus I. javanica offers an attractive biological control addition as part of the integrated pest management (IPM) practices for the control of rice plant pests.

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