Biological properties of isofetamid, a new SDHI fungicide.

The biological properties of isofetamid, a new fungicide, were examined using pot tests in a greenhouse. In addition, we investigated the practical effects of isofetamid in field trials. In greenhouse pot tests, isofetamid exhibited high preventive efficacy against cucumber gray mold, powdery mildew, Corynespora leaf spot, and stem rot even at low concentrations. Isofetamid has excellent biological properties against cucumber gray mold and powdery mildew, such as rainfastness, residual activity, curative activity, translaminar activity, and transfer activity to undeveloped leaves, even at low concentrations. In field trials, isofetamid displayed high efficacy against tomato gray mold, cucumber powdery mildew, and lettuce stem rot. Therefore, the biological properties of isofetamid revealed in greenhouse tests contributed to its good performance in field trials.