In-vitro assessment of botanicals on the growth and sclerotia production of Sclerotium rolfsii Sacc. Causing white rot of onion in Manipur

Abstract

Five locally available botanicals were evaluated for their effectiveness against growth and sclerotia production of Sclerotium rolfsii Sacc. Causing white rot of onion in Manipur. Efficacy of the aqueous plant extracts (1:1 w/v) of these botanicals at four different concentrations were compared with two different concentration of a fungicide Carbendazim by poisoned food technique. Garlic was observed to be most effective and completely inhibited 100% of mycelial growth as well as sclerotia production of the fungus at all the concentrations tested. Sweet flag at 10% inhibited 83.00% and 71.59% of mycelial growth and sclerotia production of the fungus respectively. Wild sage at 10% inhibited 82.33% of mycelial growth of the fungus. Carbendazim at 0.1% concentration inhibited 75.88% and 91.88% of mycelial growth and sclerotia production while Carbendazim at 0.05% inhibited 64.13% and 85.55% of mycelial growth and sclerotia production of the fungus respectively. All the tested botanicals at 10% concentration were effective in inhibiting mycelial growth and sclerotia production of the fungus.