Eficiência dos fungicidas no controle in vitro de fitopatógenos isolados de crotalária

Abstract

The use of Sunn hemp has been intensifying for farmers in all Brazil by its numerous advantages in the system of crop rotation and with that, the cases of fungal diseases that affect producing regions become notable. Among fungi are Fusarium udum, Sclerotium, and Choanephora infundibulifera. With that, this study aims to analyze the efficacy of fungicides in vitro control of pathogens isolated from Sunn hemp. The fungicides treatments were, Fludioxonil + Metalaxyl-M + Thiabendazole + Tiametoxam, Carbendazim, Azoxystrobin + Benzovindiflupyr, Azoxystrobin + Cyproconazole, Fluazinam, Pyraclostrobin, Pyraclostrobin + Epoxiconazol, Pyraclostrobin + Fluxapiroxade, Pyraclostrobin + Metconazole, Pyraclostrobin + Thiophanate- methyl + Fipronil, Mancozeb, Clorotalonil + Thiophanate-methyl, Trifloxystrobin + Protioconazol, Copper Hydroxide, BAS 702, BAS 540 and Procymidone. Have been assessed, mycelial growth, growth speed index, percentage of inhibition of growth, following the methodology of the incorporation of the fungicide in medium; numbers of sclerotia produced by Sclerotium sp.; percentage of germination inhibition was made in elisa plates; and fungistatic and fungicide action. The most effective fungicides on mycelial growth control in vitro of C. infundibulifera, Curvularia sp, F. udum and Sclerotium sp. were, Pyraclostrobin + Epoxiconazol, Pyraclostrobin + Metconazole and BAS 702; followed by Pyraclostrobin + Fluxapiroxade and Pyraclostrobin. On germination of Curvularia sp., Fluazinam was more efficient; and F. udum, Pyraclostrobin + Metconazole and Pyraclostrobin + Fluxapiroxade. Therefore, the tests showed that some substances used today have potential to control diseases in plants of crotalaria.