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Stem rot
Stem rot is a disease caused by a fungus infection in the stem. Fungus that causes stem rot are Rhizoctonia, Fusarium and Pythium. Stem rot can readily infect crops that are in their vegetative or flowering stages. The disease can survive up to five years in the soil.〔Peltier, Angelique J., Carl A. Bradley, Martin I. Chilvers, Dean K. Malvick, Daren S. Mueller, Kiersten A. Wise, and Paul D. Esker. "Biology, Yield Loss and Control of Sclerotinia Stem Rot of Soybean." Journal of Integrated Pest Management 3.2 (2012): 1-7.〕 Symptoms of stem rot includes staining of infected area, reduced crop yield and crop failure. The disease can be spread through the use of unfiltered water as well as unsterilized tools. Also leaving previous dead roots in soil can increase the risk of stem rot. Spores can also enter the plant through injured stem tissue on the plant including from insect attacks. The fungus impedes stem functions like transporting nutrients. It can cause water to leak through the lesions of stem tissue. Common infected crop plants are soybeans and potatoes. An issue with maintaining this disease is the lack of management by crop producers. Producers of soybeans tend to not manage for the disease because it is not normally yield limiting in a large area. Fungicides can be used to manage the disease as well as burning the crop after harvest or letting it decompose.
〔Giesler, Loren J. "Soybean Disease." Sclerotinia Stem Rot,. University of Nebraska-Lincoln, n.d. Web. 17 Dec. 2014〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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