Efficacy of plant oils and their major monoterpenes in addition to powder formulation and seed cake of caraway oil on bacterial wilt incidence in potato

Document Type : Original Article

Authors

1 Central Agric. Pesticide Lab., Agric. Res. Center, Plant Protection Res. Station, Bacous, Alexandria, Egypt.

2 Plant Pathology Res. Institute, Agric. Res. Center, Plant Protection Res. Station, Bacous, Alexandria, Egypt.

10.21608/jpces.2007.459654

Abstract

Pot experiments were conducted to determine the efficiency of plant essential oils and monoterpenoides, carvone, thymol and menthol to control bacterial wilt in potato caused by Ralstonia solanacearum as potato seed tubers or soil treatments. Soil infested with R.. solanacearum was treated with the plant oils or their main components by the drench method at 0.5 and 1% concentrations using 200 ml of aqueous emulsion/pot. Caraway and thyme oils and the monoterpenes; carvone, thymol and menthol (1%) gave complete protection of potato plants from the infection by R. solanacearum, 6 weeks after inoculation. Peppermint oil (1%) gave reasonable effect in reducing wilt infection by 83% relative efficiency, whereas the neem oil showed no bactericidal activity as all treated plants wilted. Seed tuber treatment by powder formulation of caraway oil (1.3% carvone) at 3 and 5 g/kg seed tubers showed significant reduction in wilt severity with reduction percentages of 92 and 100%, respectively compared with the untreated inoculated control. Treatment of the soil with caraway seed cake at 10, 15 and 20 g/kg soil resulted in reduction of bacterial wilt severity by 58, 75 and 100%, respectively. Complete protection of potato from bacterial wilt incidence was obtained by the joint treatment of both soil treatment by caraway seed cake (15 g/kg soil) and seed tubers treatment by powdered caraway oil at 3 g/kg seeds. The observed high efficacy of these plant oils and their main components, in reducing bacterial wilt infection and increasing percentage of healthy plants, pointed out that these plant products have important roles in bacterial disease management.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 15, Issue 2
December 2007
Pages 1-12

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