CONTROLLING AGENT AGAINST PLANT BLIGHT BY USING FUNGUS OF CLASS PHYCOMYCETES

摘要

PURPOSE:A controlling agent, containing a phosphorothionoamidate obtained by condensing a thionophosphoramide chloride with nitrophenol, etc. as an active constituent, and capable of exhibiting a preventing and treating effect on plant blights caused by fungi of the class Phycomycetes. CONSTITUTION:A controlling agent against the plant blight caused by fungi of the class Phycomycetes, containing a phosphorothionoamidate, e.g. O-ethyl O-(2-nitro-5-methoxyphenyl) N-sec-butyl phosphorothionoamidate, expressed by formulaI(R1 is lower alkyl, lower cycloalkyl or lower alkenyl; R2 and R3 are lower alkyl) as an active constituent. The agent is effective for preventing and treating blights of vegetables, Japanese radishes, spinaches, cucumbers, etc. caused by Peronospora brassicae, Peronospora spinaciae, Pseudoperonospora cubensis, etc. and blights of apples and strawberries caused by Phytophthora cactorum, etc., blight of cucumbers caused by Phytophthora capsici and blight of tobaccos caused by Phythium debaryanum. The compound of formulaIis obtained by reacting a thionophosphoramide chloride of formula II with a nitrophenol of formula III, etc.