Studies on transeliminases in Phytophthora colocasiae: inhibitory effects of plant growth regulators, phenolics and fungicides.
All the growth regulators tested (IAA, IBA, GA, K, 2,3,4-T) and 10 and 100 p.p.m. checked the production of polygalacturonate transeliminase and pectin methyl transeliminase by this pathogen of Colocasia esculenta, but none could completely prevent it. Ferulic acid, m-hydroxybenzaldehyde, phloroglucinol and vanillin at 10, 50 and 100 p.p.m. were also inhibitory, as were all 6 fungicides tested, especially Apron 350 FW (metalaxyl), Ridomil 25 WP (metalaxyl) and Topsin M (thiophanate-methyl).