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The essential oil from the leaves of Hyptis suaveolens (L.) Poit. (Family-Labiatae), a herbaceous annual weed, has been found to have significant antifungal activity against the soil-borne sclerof ial fungi, Rhizoctonia solani, Sclerof ium rolfsii and Sclerof inia sclerof iorum. Treatment with the oil drastically reduced the ascospore germination of S. sclerof iorum. More importantly, the oil in combination with antagonistic fungus Trichoderma harzianum controlled wilt and rof diseases of knol-khol (Brassica caulorapa Pasq.) caused by S. sclerof iorum. The oil appears to inhibit the fungal growth, but does nof destroy the viability of the three sclerof ial fungi.
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Singh et al. (1997) studied this question.
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