EFFECT OF MANNICH-BASES ON SOME PLANT-PATHOGENIC FUNGI

3-(2-Pyridyl)-3-iminoisatin, 1-piperidinomethyl-3-(2-pyridyl)-3-iminoi satin and 1-acetyl-3-(2-pyridyl)-3-iminoisatin affect spore germinatio n of Alternaria alternata, A. carthemi, Curvularia lunate, Fusarium ox ysporum f.sp. ciceri and F. udum and influence the development of powd ery mildew (Erysiphe pisi) on pea under glasshouse condition as well a s conidial germination of E. pisi on excised pea leaves. Spore germina tion was inhibited in the sequence 1-acetyl-3-(2-pyridyl)-3-iminoisati n > 1-piperidinomethyl-3-(2-pyridyl)-3-iminoisatin > 3-(2-pyridyl)-3-i minoisatin followed the order accordingly The powdery mildew developme nt and conidial germination of E.pisi 1-piperidinomethyl-3-(2-pyridyl) -3-iminoisatin > 1-acetyl-3-(2-pyridyl)-3-iminoisatin > 3-(2-pyridyl)- 3-iminoisatin. The chemicals were compared with commonly used antifung al fungicides.