Characterization and evaluation of fungicide activity of wood extractives in Trichoderma and Rhizoctonia
Abstract
New sources of substrate to orchids are required in order to substitute the traditional xaxim substrate. For this purpose, wood from Eucalyptus and Pinus become attractive. However, the extrac-tives from those wood plants, responsible for smell, taste, color and defense, can inhibit the develop-ment of orchid symbiont fungi. This work reports the chemical characterization of extractives of the-se plants and their biological activity against Trichoderma sp. and a Rhizoctonia isolates, important orchid symbionts. The main chemical compounds were linoleic and oleic acids, found in Pinus, and β-sitosterol in Eucalyptus. The extractives displayed no biological activity against the tested organisms, and one can conclude that Pinus and Eucaplyptus wood present good potential as orchid substrates.
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