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Induction of soil suppressiveness to verticillium wilt of potato by successive croppings

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Abstract

Nine soils collected in New Jersey and Maryland were infested with microsclerotia ofVerticillium dahliae and planted with potato cv. Superior for five successive crops in the greenhouse to induce suppressiveness to Verticillium wilt. Potatoes were harvested 9–12 wk after planting and disease incidence was determined by recovery ofV. dahliae from stem segments on selective medium. Six of the nine soils had high disease incidence during the first cropping and remained conducive to Verticillium wilt throughout the experiment. Disease incidence increased in soils 3 and 9 over time, while disease incidence decreased nonlinearly in soil 1. Viability of microsclerotia buried in soil 9 for 4 wks was reduced compared to the viability of microsclerotia buried in soils 1, 3, and 6. Addition of 50 or 100 g hydrated lime/10 kg soil to soil 9 eliminated its suppressiveness to Verticillium wilt. Repeated cropping of the same soil can induce suppressiveness to Verticillium wilt. Soils exhibiting induced suppressiveness may be a source of new antagonists againstV. dahliae.

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  1. Anthony P. Keinath

    Present address: Coastal Research and Education Center, Clemson University, 2865 Savannah Highway, 29414, Charleston, SC

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    1. Anthony P. Keinath
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    2. Deborah R. Fravel
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    USDA, ARS, Biocontrol of Plant Diseases Laboratory, Room 275 Building 011A, Belts-ville Agricultural Research Center-West, Beltsville, MD 20705-2350.

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    Keinath, A.P., Fravel, D.R. Induction of soil suppressiveness to verticillium wilt of potato by successive croppings. American Potato Journal 69, 503–513 (1992). https://doi.org/10.1007/BF02853839

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