BIOLOGICAL PROPERTIES OF FUNGITOXIC PROPARGYL N(6-ETHYL-5-IODO-2-PYRIDYL)CARBAMATE

Propargyl N-(6-ethyl-5-iodo-2-pyridyl) carbamate (PEIP) exhibited high fungitoxic activities against Erysiphe graminis f. sp. tritici, Scler otinia sclerotiorum, Botrytis cinerea, Pyricularia oryzae, and Rhizoct onia solani at 0.1 ppm in vitro and 8 to 63 ppm in vivo. It also showe d activity against benzimidazole-resistant isolates of B. cinerea as w ell as the sensitive isolates. PEIP possessed not only preventive acti vity, but also curative activity and translaminar action. The excellen t activity of PEIP against B. cinerea and Elsinoe ampelina was also co nfirmed in field trials. PEIP induced morphological changes in the con idial germination and nuclear arrangement in germ-tubes of B. cinerea in a similar manner to that of benomyl, a benzimidazole fungicide. The se results suggest that PEIP interferes with the cell division of this fungus.