首页|Synergistic effects of the entomopathogenic fungus Isaria javanica and low doses of dinotefuran on the efficient control of the rice pest Sogatella furcifera
Synergistic effects of the entomopathogenic fungus Isaria javanica and low doses of dinotefuran on the efficient control of the rice pest Sogatella furcifera
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Synergistic effects of the entomopathogenic fungus Isaria javanica and low doses of dinotefuran on the efficient control of the rice pest Sogatella furcifera
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 (1×104 conidia mL-1) and a low dose of dinotefuran (～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 post-treatment.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.
Isaria javanicaSogatella furciferaentomopathogenic funguswhite planthopperricesynergistic effect on pest control
Department of Entomology,College of Plant Protection,South China Agricultural University,Guangzhou 510642,China
Guangdong Provincial Key Laboratory of High Technology for Plant Protection,Plant Protection Research Institute,Guangdong Academy of Agricultural Sciences,Guangzhou 510642,China
Department of Microbiology and Cell Science,Institute of Food and Agricultural Sciences,University of Florida,FL 32611,USA
Isaria javanica Sogatella furcifera entomopathogenic fungus white planthopper rice synergistic effect on pest control
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