Fungitoxicity of some higher plants and synergistic activity of their essential oils against Sclerotium rolfsii sacc. causing foot-rot disease of barley.
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Abstract
Twenty five plant species were screened for their volatile components against hyphal growth and sclerotia formation of Sclerotium rolfsii causing foot rot disease of barley (Hordeum vulgare). Leaves of Chenopodium ambrosioides (CA), Lippia alba (LA), Azadirachta indica (AI) and Eucalyptus globulus (EG) were found to be strongly toxic. Their volatile active factors were isolated in the form of essential oils which were tested for toxicity individually and in six combinations (1:1 v/v) viz. CA-LA, LA-AI, CA-AI, CA-EG, and EG-AI. The oil combinations were found to be more fungitoxic than the individual oils. The CA-LA, LA-AI, EG-AI, and CA-EG combinations exhibited a broad fnngitoxic spectrum while CA-AI, LA-EG combinations possessed a narrow range of toxicity. None of the six oil combinations showed phytotoxic behaviour on seed germination, seedling growth and general morphology of Hordeum vulgare.
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