Suppression of brown planthopper, Nilaparvata lugens (Homoptera: Delphacidae), by Beauveria bassiana (Deuteromycotina) and Buprofezin

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J. of Plant Prot. Tropics



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Different rates of dry mycelium of the entomogenous fungus Beauveria bassiana and suspensions of conidia of B. bassiana, Metarhizium anisopliae, and M. flavoviride var. minus were evaluated for the suppression of populations of the brown planthopper, Nilaparvata lugens, on rice in Korea. The dry mycelium was applied at rates equivalent to 200 and 2000 g/ha; the conidia at rates equivalent to 7.5 times 1012 conidia/ha (B. bassiana and M. anisopliae) and 4 times 1012 conidia/ha (M. flavoviride).

Significant control of the populations was achieved at 7 days and 22 days after application and up to harvest of the rice crop. Differences between treatments were present but not consistent, except for M. flavoviride which had significant more insects compared to most other fungal treatments at the 22 day interval. The fungi were re‐isolated from infected insects, except for M. flavoviride, which infected the brown planthopper, but did not sporulate on the host, which prevented secondary infections. The dry mycelium preparations of B. bassiana were as effective as the conidial sprays and should be evaluated for use in biological control of the brown planthopper in Korea.

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