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Monitoring and characterization of Magnaporthe grisea isolates with decreased sensitivity to scytalone dehydratase inhibitors
Author(s) -
Sawada Haruko,
Sugihara Minoru,
Takagaki Makiichi,
Nagayama Kozo
Publication year - 2004
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.858
Subject(s) - magnaporthe grisea , biology , fungus , dehydratase , microbiology and biotechnology , oryza sativa , genetics , botany , gene
Rice blast fungus isolates were collected in Kyushu to investigate resistance to scytalone dehydratase inhibitors of melanin biosynthesis (MBI‐D). In 2001, failure of control of rice blast was reported in the Saga prefecture, where MBI‐Ds have been used since 1998. At that time, the distribution of resistant isolates was mainly limited to that area. However, in 2002, resistant isolates were detected in all prefectures of Kyushu. DNA fingerprinting analysis showed that the mutation causing resistance to MBI‐Ds had arisen independently in each area. These data suggest that resistant isolates may occur in any area and become dominant under continuous selection pressure for MBI‐Ds. Nevertheless, resistant strains can be controlled by reductase inhibitors of melanin biosynthesis (MBI‐R) or commercial rice seed disinfectants. Copyright © 2004 Society of Chemical Industry