In vitro efficacy of different fungicides against Sclerotium rolfsii sacc. Causing stem rot of tuberose (Polianthes tuberosa L.)

The bio assay of fungicides forms the prerequisite for the field evaluation. In this study efficacy of four systemic fungicides (Carbendazim, Thiophanate methyl, Tricyclazole, Hexaconazole) and four non-systemic fungicides (Captan, Mancozeb, Chlorothalonil, Copper oxy-chloride) were evaluated at four different concentrations viz., 100, 200, 300 and 400 ppm, against Sclerotium rolfsii causing stem rot of tuberose under in vitro condition. The results revealed that among the systemic fungicides Hexaconozole showed 100 percent inhibition of mycelia growth at all the concentrations tested. This was followed by Tricyclozole which showed 100 per cent inhibition of mycelia growth only at higher concentration i.e., 600 ppm. Among the non systemic fungicides Mancozeb was highly effective as it showed hundred per cent inhibition of mycelial growth at 200, 400 and 600 ppm respectively. Whereas Copper oxychloride did not show any inhibition of the mycelial growth at all the four concentrations tested