メロンえそ斑点病
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概要
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Necrotic spot of muskme1on, a virus disease new to Japan, was found in Shizuoka and a few other Prefectures. Three types of leaf symtoms are recognized: (I) necrotic specks, appearing in abundance on later deve1oping leaves after infection, (II) large necrotic spots, and (III) veinal necrosis. Type II and type III symptoms are usua11y seen on mature leaves. On the stem and petioles, necrotic streaks are produced. On mechanica1 inoculation, the virus incited primary 1ocal lesions and systemic necrotic spots on muskme1on, canta1oup, and makuwa (Cucumis melo var. makuwa). It produced 1oca1 1esions, but no systemic infection, on waterme1on, cucumber (Chicago Pick1ing), and oriental pick1ing me1on (Cucumis me1o var. conomon). It did not infect other cucurbits, invo1ving squash, white gourd (Benincasa hispida), bottle gourd (Lagenaria siceraria var. hispida), bonnet gourd (Luffa cy1indrica), and oriental varieties of cucumber, and 22 species of non-cucurbitaceous plants. The virus was seed-transmitted in a moderate percentage (about 20%). A test for transmission by Aphis gossypii was negative. Test with beetles has not yet been made. The virus in expressed sap was not inactivated in 10 minutes at 60℃, during 9-10 days aging in vitro, or at l:50,000 dilution. Purified preparation of the virus showed, by electron microscopy, spherical particles of about 31 mμ in diameter (Saito, Kishi, and Iwata, 1962). Among the known viruses infective to cucurbits, wild cucumber mosaic virus described by Freitag (1952) and Lindberg et al. (1956) seems to be most c1osely related to the present virus, though there are slight differences in symptoms and host range.(Received October 20,1965)
- 1966-06-30
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