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Effects of some plant materials on phytophthora blight (Phytophthora capsici Leon.) of pepper



Effects of some plant materials on phytophthora blight (Phytophthora capsici Leon.) of pepper



Turkish Journal of Agriculture and Forestry 30(4): 247-252



Effects of dried garlic, peppermint, cabbage, lentil, alfalfa, onion, radish, and garden cress plant materials on Phytophthora blight (Phytophthora capsici Leon.) of pepper were determined, in both in vitro and in vivo conditions. Extracts of the plant materials were used in vitro. The plant materials were extracted in ethanol and were added to corn meal agar (CMA) at 5 and 10 mu g ml(-1). The extracts of alfalfa, garlic, cabbage, and peppermint reduced colony diameter of P. capsici on corn meal agar between 3.46% and 13.73%, whereas mycelial growth of P. capsici was increased by onion, radish, garden cress, and lentil extracts. The plant materials inhibitory to mycelial growth of P. capsici were incorporated into soil inoculated with P. capsici, in pots and also in the field, in order to determine their effects on Phytophthora blight severity. The severity of Phytophthora blight of pepper was markedly reduced by cabbage, garlic, and alfalfa materials by 15.3%, 39.8% and 46.9%, respectively, in pot trials. No significant effect of peppermint on disease severity was found. In the field infested with P. capsici, disease severity decreased with cabbage, garlic, and alfalfa by 89.5%, 40%, and 10.7%, respectively. Peppermint slightly increased the disease severity (3.4%). In this study, dry cabbage, garlic, and alfalfa materials were effective in reducing the severity of disease caused by P. capsici. in both in vitro and in vivo conditions.

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