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Effect of Cultural Management Practices on the Severity of False Smut and Kernel Smut of Rice

Permanent URL:
http://handle.nal.usda.gov/10113/37353
File:
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Abstract:
False smut (Ustilaginoidea virens) and kernel smut (Neovossia horrida) are diseases of rice (Oryza sativa) that reduce both grain yield and quality. False smut is an emerging disease worldwide that is rapidly gaining in importance, whereas kernel smut has historically been a chronic minor disease with sporadic outbreaks that cause considerable losses. Highly effective disease control was obtained for susceptible cultivars by employing conservation tillage (69% reduction in false smut), continuous rice cropping (88% reduction in false smut), and moderate nitrogen fertility rates (34 and 60% reductions in false smut and kernel smut, respectively). Combining these treatments nearly eliminated smuts from cultivars that were fully susceptible under conventional cultivation practices. Furthermore, using a nursery designed to promote smut diseases, two rice hybrids were identified that possessed kernel smut resistance under the most favorable disease conditions. The genetic basis of the resistance is unknown. However, the utility for disease control is great because hybrids occupy significant portions of production rice acreage.
Author(s):
Brooks, Steven A. , Anders, Merle M. , Yeater, Kathleen M.
Subject(s):
Oryza sativa , rice , Ustilaginoidea , Tilletia barclayana , plant pathogenic fungi , smut diseases , crop management , disease control , disease severity , disease incidence , conservation tillage , continuous cropping , nitrogen fertilizers , fertilizer rates , disease outbreaks , disease resistance , genetic resistance
Format:
p. 1202-1208.
Note:
Includes references
Source:
Plant disease: an international journal of applied plant pathology 2009 Nov., v. 93, no. 11
Language:
English
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.