Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: March 20, 2011
Publication Date: August 6, 2011
Citation: Zhou, X.G., Tabien, R.E., Mcclung, A.M. 2011. Field disease reaction of rice cultivars and elite lines in Texas [abstract]. Phytopathology. 101:S204. Technical Abstract: The development and use of improved disease-resistant rice cultivars remains of foremost importance to rice producers. Field evaluation of disease resistance under local environments is essential toward this effort. More than 48 cultivars and Texas elite breeding lines were evaluated for resistance to sheath blight (Rhizoctonia solani), bacterial panicle blight (Burkholderia glumae), and narrow brown leaf spot (Cercospora janseana), the three major rice diseases in Texas, in five trials located at two locations of Texas in 2009 and 2010. Sheath blight was introduced by inoculation, while narrow brown leaf spot came from natural infection. Bacterial panicle blight developed from either natural infection or bacterial inoculum at the heading stage. All but several cultivars and lines were susceptible or very susceptible to sheath blight, with disease severity ratings of 5 or above on a 0–9 scale. CL142-AR, Jasmine 85, Milagro Filipino, Templeton, Rondo, and the hybrid XL723 showed partial resistance to sheath blight. In reaction to bacterial panicle blight, all cultivars and lines were susceptible except Catahoula, Jupiter, Spring, XL723, and the two TX elite lines RU0703190 and RU0703144 which showed partial resistance. Except CL181-AR, Jazzman, Sabine, and Sierra, all others were resistant or moderately resistant to narrow brown leaf spot. CL151, Presidio, Tesanai 2, and RU0703190 had grain yields that ranked among the highest.