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Botrytis stem rot of tuberous-rooted begonia

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  • Tompkins, C. M.

Abstract

Principal environmental factors favoring the disease are relatively cool, foggy weather, overwatering, and crowding of the plants. Disease symptoms consist of dark-brown, watersoaked, occasionally sunken and shriveled, irregular-shaped lesions which usually occur at or near the base of the main stem of the plant. Lesions may also develop at some distance above the soil line, at nodes or internodes, and may coalesce to form larger lesions. In advanced stages, the internal tissues are completely invaded, the stem breaks at the lesion site, and the top of the plant falls. Infection may also occur on the axils of leaves and through leaf scars and growth cracks caused by heavy nitrogenous fertilization.

Suggested Citation

  • Tompkins, C. M., 1950. "Botrytis stem rot of tuberous-rooted begonia," Hilgardia, California Agricultural Experiment Station, vol. 19(13).
    • Handle: RePEc:ags:hilgar:381785
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