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KMID : 1160220140420040385
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Mycobiology
2014 Volume.42 No. 4 p.385 ~ p.390
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Virulence of Entomopathogenic Fungi Metarhizium anisopliae and Paecilomyces fumosoroseus for the Microbial Control of Spodoptera exigua
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Han Ji-Hee
Jin Byung-Rae
Kim Jeong-Jun
Lee Sang-Yeob
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Abstract
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The beet armyworm Spodoptera exigua (Lepidoptera: Noctuidae) is difficult to control using chemical insecticidesbecause of the development of insecticide resistance. Several pest control agents are used to control the beet armyworm. Entomopathogenic fungi are one of the candidates for eco-friendly pest control instead of chemical control agents. In this study,among various entomopathogenic fungal strains isolated from soil two isolates were selected as high virulence pathogens againstlarva of beet armyworm. Control efficacy of fungal conidia was influenced by conidia concentration, temperature, and relativehumidity (RH). The isolates Metarhizium anisopliae FT83 showed 100% cumulative mortality against second instar larvae of S. exigua 3 days after treatment at 1 × 107 conidia/mL and Paecilomyces fumosoroseus FG340 caused 100% mortality 6 days aftertreatment at 1 × 104 conidia/mL. Both M. anisopliae FT83 and P. fumosoroseus FG340 effectively controlled the moth at 20~30oC. M. anisopliae FT83 was significantly affected mortality by RH: mortality was 86.7% at 85% RH and 13.4% at 45% RH. P. fumosoroseus FG340 showed high mortality as 90% at 45% RH and 100% at 75% RH 6 days after conidia treatments. Theseresults suggest that P. fumosoroseus FG340 and M. anisopliae FT83 have high potential to develop as a biocontrol agent againstthe beet armyworm.
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KEYWORD
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Beet armyworm, Entomopathogenic fungi, Metarhizium anisopliae, Paecilomyces fumosoroseus, Spodoptera exigua
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