Submitted to: Plant Disease Management Reports
Publication Type: Other
Publication Acceptance Date: December 6, 2010
Publication Date: March 28, 2011
Citation: Zhou, X., McClung, A.M., Cammack, J.L. 2011. Responses of rice cultivars and elite lines to diseases in conventional production system, 2010. Plant Disease Management Reports. 5:FC095. Technical Abstract: The experiment was established in a field of League-type soil (3% sand, 32% silt, and 64% clay) under organic management for many years at the Texas A&M University System's Agrilife Research and Extension Center, Beaumont. Twenty rice cultivars and lines were arranged in a randomized complete block design with four replications. Plots consisted of six 15-ft rows, and spaced 7 inches between rows. Rice was drill seeded at 100 lb/A on 15 Apr. Plots received 50 lb/A of urea at planting, and an additional application of 70 lb/A of urea at panicle differentiation on 11 Jun. For weed control, plots were applied with Command (1 pt/A), Aim EC (1.0 fl oz/A), and Permit (1 oz/A) on 16 Apr, and Bolero 8E (2 pt/A), Basagran (1pt/A) and Stam 80 EDF (3 lb/A) on 6 May, and Aim EC (1 fl oz/A) on 11 Jun. The insecticide Karate Z at 2 fl oz/A was applied to plots for control of insects including stalk borers on 17 Jun. Quilt at 21 fl oz/A was applied on 17 Jun for control of diseases. Permanent flood was established on 10 May and plots were irrigated as locally recommended. On 9 Aug, severity of bacterial panicle blight, narrow brown leaf spot, brown spot and leaf smut were rated on a scale of 0 to 9, where 0 represents no symptoms and 9 represents most severe. All diseases resulted from natural inoculum. Plots were harvested using a plot combine at the maturity stage of individual cultivars and lines, and grain yield adjusted to 12% grain moisture. Due to favorable high nighttime temperatures at the flowering stage, bacterial panicle blight occurred on all cultivars and lines, with MCRO2-1572 having the highest severity and Bengal, Cybonnet, Jazzman, PI338046, and Tesanai 2 having the moderate levels. Narrow brown leaf spot moderately occurred on Cocodrie, Cybonnet, Jazzman, Jeff Nil farm 43, RU0703190, and Sierra. All cultivars and lines had no or little brown spot. Leaf spot severity was low in general although Cocodrie, Cybonnet, and Presidio had moderate levels of the disease. GP2, Tesanai 2, Jupitor, and Rondo had yields that ranked among the highest.