These compounds
showed potent control efficacy against Phytophthora
blight in pepper plants at a concentration of
500 lg ⁄ ml. A novel butanoic acid thiobutacin, 4-(2-
aminophenyl)-4-oxo-2-methylthiobutanoic acid (Fig. 3)
isolated from the culture broth of Lechevalieria aerocolonigenes,
also showed antioomycete and antifungal
activities against P. capsici and B. cinerea