Effect of carpropamid on secondary infection by rice blast fungus

Carpropamid (WIN™, KTU 3616) provides good control of leaf and panicle blast by ‘one‐shot’ nursery‐box treatment. It inhibits melanin biosynthesis in appressorial cells of Pyricularia oryzae, making them hyaline. Penetration by infection hyphae from the hyaline appressoria into rice epidermal cells...

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Bibliographic Details
Published in:	Pesticide Science Vol. 55; no. 1; pp. 31 - 37
Main Authors:	Kurahashi, Yoshio, Sakawa, Shinji, Sakuma, Haruhiko, Tanaka, Keiko, Haenssler, Gerd, Yamaguchi, Isamu
Format:	Journal Article Conference Proceeding
Language:	English
Published:	London John Wiley & Sons, Ltd 01-01-1999 Wiley London :John Wiley & Sons Ltd
Subjects:	Biological and medical sciences carpropamid Chemical control Control Fundamental and applied biological sciences. Psychology Fungal plant pathogens melanin-biosynthesis inhibitor Oryza sativa Phytopathology. Animal pests. Plant and forest protection Pyricularia oryzae secondary infection spore-liberation inhibition Pyricularia grisea Monocotyledones Plant pathogen Treatment efficiency Pesticides Synthetic inhibitor Fungicide Cereal crop Spores Fungi Pathogenicity Organic pigment Oryza sativa Gramineae Sporulation Angiospermae Chemical control Carboxamide Organic amide Spermatophyta Fungi Imperfecti Melanin Thallophyta
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Summary:	Carpropamid (WIN™, KTU 3616) provides good control of leaf and panicle blast by ‘one‐shot’ nursery‐box treatment. It inhibits melanin biosynthesis in appressorial cells of Pyricularia oryzae, making them hyaline. Penetration by infection hyphae from the hyaline appressoria into rice epidermal cells is substantially hindered. In addition, the spread of rice blast spores from primary lesions to the other parts of the plant leading to secondary infection is largely prevented when the plants are treated with carpropamid by spray or water surface application. Secondary infection was simulated in a glass chamber fitted with an ultrasonic humidifier. On treated plants, many blast spores formed in the lesions, but the number of air spora that were dispersed from the lesions decreased significantly. A similar suppression of the spore liberation was observed in vitro when lesions on rice leaf segments, or discs from Pyricularia cultures on oatmeal agar were treated with the chemical. Spores from treated lesions or from the cultures on oatmeal agar amended with the chemical germinated normally and produced well‐melanized appressoria on cellophane membranes. In addition, the spores proved to be fully pathogenic towards rice seedlings, producing normal disease symptoms. These results strongly suggest that carpropamid reduces the secondary infection of rice by Pyricularia by specifically hindering spore liberation. © 1999 Society of Chemical Industry
Bibliography:	ark:/67375/WNG-0Z40DN5F-M ArticleID:PS865 istex:734084912EC135FD67CAEE666B2A6A5FACB2C508 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0031-613X 1526-498X 1096-9063
DOI:	10.1002/(SICI)1096-9063(199901)55:1<31::AID-PS865>3.0.CO;2-J