SUBSTITUTED 4(3H) QUINAZOLINONES HAVING FUNGICIDAL PROPERTIES, COMPOSITIONS BASED THEREON, AND METHODS OF CONTROLLING POWDERY MILDEW Russian patent published in 1999 - IPC

FIELD: control of powdery mildew of crops both for prophylaxis and in case of contamination. SUBSTANCE: described are 4(3H)quinazolinones of general formula I: R¹ wherein Q is 0; C₃-C₁₀ is R² alkyl or cyclopropylmethyl; C₃-C₁₀ is R³ alkyl; R⁴ is halogen, and R¹ is hydrogen or halogen provided that when R² is cyclopropylmethyl, CH₂CH₂CH₃ is R³; R⁴ is 6-8 and is H. Said compounds have fungicidal activity. EFFECT: improved properties of the title compounds and more efficient control method. 1 cl, 4 ex, 5 tbl