2-phenyliminothiazolines of the following formula I, their
salts, their preparation method and their use for treating rice blast. The phenyliminothiazolines
and their salts of the present invention have low toxicity to environment or living
organisms, and exert high activity at low concentration for treating rice blast
through a new control mechanism, that is by inhibiting pentaketide synthesis and
cyclization of the melanin sythesis process in formula I
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