ツマジロクサヨトウおよびハスモンヨトウ (チョウ目: ヤガ科) から 分離された緑きょう病菌の交差病原性. (Japanese)

In 2020, many fall armyworms (FAW; Spodoptera frugiperda) infested with an entomopathogenic fungus were collected from maize fields in Southern Kyushu. In this study, three isolates of FAW fungus and one from common cutworm (CCW; Spodoptera litura) were identified by DNA sequencing as Metarhizium rileyi (formerly Nomuraea rileyi) and found to be closely related to each other. Three fungal isolates from FAW in Kashiwabaru, Satsuma Town; Kinpo, Minamisatsuma City; and Nonomitani, Miyakonojo City, as well as one isolate from CCW in Korimoto, Kagoshima City, were inoculated onto third instar FAW and CCW larvae. The LC50 value ratios of FAW to CCW were 1.14, 0.049, 1.91, and 13.94, respectively, indicating either similar virulence against both species or greater virulence against CCW; only the Kinpo isolate was more virulent against FAW. The LC50 against FAW was 9.7×10³ to 9.6×10⁵ conidia*ml ^-1. These three strains, other than the Kimpo isolate, were more virulent to CCW, but would also be expected to contribute to FAW mortality in the field. [ABSTRACT FROM AUTHOR]

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