| Efficacy of Fluazinam and Iprodione+Propineb in the Suppression of Diaporthe phaseolorum, Colletorichum truncatun and Cercospora kikuchii, the Causal Agents of Seed Decay in Soybean |
|
Jeung Haing Oh, Nag Won Kang |
|
|
| Abstract |
|
Seed decay of soybean caused by Diaporthe phaseolorum, Colletotrichum truncatum, and Cercospora kikuchii is a serious disease when soybean is harvested under warm and wet weather conditions. Benomyl has been used for controlling the disease, however, benomyl application may be limited due to common occurrence of resistance. The efficacy of 21 fungicides against the pathogens was evaluated in vitro. Among the fungicides tested, benomyl, carbendazim, fluazinam, iprodione+propineb, thiophanate- methyl, and triflumizole were found effective and were evaluated for their ability to control the seed pathogens. Fluazinam completely inhibited mycelial growth at a concentration of 100 mg/ml for D. phaseolorum; and at a concentration of 500 mg/ml for C. truncatum and C. kikuchii. EC90 values of fluazinam were similar to that of benomyl. Because fluazinam, iprodione+propineb, and triflumizole were found effective against the seed pathogens, these were subjected for field-testing. Suppression of pod and seed infection by fluazinam and iprodione+propineb was as high as that of benomyl without any reduction in agronomic characters of soybean. This study shows that fluazinam and iprodione+propineb may be used in combination with benomyl to control seed pathogens, manage resistance, and ensure production of high quality soybean seeds. |
| Key Words:
benomyl, fluazinam, iprodione+propineb, seed pathogens, soybean |
|
PDF Links
Full text via DOI
Download Citation
