Colletotrichum dematiumによるアガパンサス炭疽病(新称)
| Autor: | Yuuki, Murata, Natsuaki T. Keiko, Kobayashi Takao |
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| Jazyk: | japonština |
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| Popis: | 2004年5月茨城県取手市で激しい葉枯症状を呈するアガパンサスを採集した。病葉上には剛毛を有する分生子層が肉眼では多数の小黒粒点として観察でき,培養菌叢はPDA培地上で暗灰色～黒色,分生子は鎌形で大きさ15.0～21.5×2.5～3.7μmであった。これらの形態的特徴から,本菌をColletotrichum dematium (Per. : Fr.) Groveと同定した。接種試験による病原性の確認を行った結果,接種約1週間後に病徴が再現され,病斑部から本菌が再分離された。これらの結果から,本病はC. dematiumによって引き起こされたことが明らかになり,病名としてアガパンサス炭疽病を提言した。 In 2004, a new disease was found on African lily (Agapanthus africanus (L.) Hoffmanns.) leaves, in Ibaraki prefecture, Japan. Brown to grayish brown leaf blight lesions were observed on over-wintered leaves. A fungus belonging to the genus Colletotrichum was observed on these lesions. Its acervuli had setae. The colonies were black or dark gray on PDA medium. Conidia were aseptate, hyaline, falcate, and 15.0～21.5×2.5～3.7μm (17.3×3.0μm in average). Appressoria were oval or slightly irregular, dark brown colored and 9.5～18.7×5.2～10.0μm in size. Based upon these morphological characteristics, this fungus was identified as Colletotrichum dematium (Per. : Fr.) Grove. Isolated fungus was pathogenic to the original host plant in artificial inoculation test. This is the first report describing the African lily disease caused by C. dematium in Japan. Therefore, anthracnose of agapanthus (agapanthus tanso-byo) is proposed as a new disease in Japan. |
| Databáze: | OpenAIRE |
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