Disease resistance and yield performance of rice cultivars under organic production
Xingen Zhou: Texas A&M AgriLife Research
<div>Disease resistance and yield performance of rice cultivars under organic production systems in the US remain largely unknown. Narrow brown leaf spot (NBLS) caused by <em>Cercospora janseana</em> and brown spot caused by <em>Cochliobolus miyabeanus</em> are two common diseases affecting organic rice production. A 2-year study was conducted in a field under organic management at Beaumont, Texas to evaluate 20 (2016) or 10 (2017) rice cultivars and germplasm lines for their resistance to these diseases and yield performance. Jasmine 85, PI312777, Rondo, Tesanai 2, XL723, and XL753 consistently showed high levels of resistance to NBLS while Cocodrie, Jazzman 2, Presidio, and Sierra were either susceptible or very susceptible to NBLS. None of the cultivars evaluated showed complete resistance to brown spot. Most of the cultivars, including Cocodrie, Jasmine 85, XL723 and XL753, were either susceptible or very susceptible to brown spot. Jasmine 85, PI312777, Rondo, Tesanai 2, and XL753 were among the best cultivars showing good stand establishment, vigorous growth, and high yield potential while Cocodrie, Jazzman 2, Presidio, and Sierra showed lowest yields. Selection of a resistant cultivar with high yield potential is the best approach for effective management of NBLS and brown spot and maximizing the returns of organic rice production.</div>
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