Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1986
Published in Agron J 78:148-150 (1986)
© 1986 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Dwarf Bunt of Wheat in China: Potential Sites from Satellite Studies1

E. J. Trione and M. J. Hall2

Common bunts of wheat (Triticum species) caused by Tilletia caries (DC.) Tul. and T. foetida (Wall.) Liro are present in China, but dwarf bunt has not been reported. Beginning in 1974, wheat shipments from U.S. Pacific Coast states to the People's Republic of China were stopped because they contained spores of the dwarf bunt fungus (Tilletia controversa Kuhn), a pathogen affecting winter wheat. This quarantine against T. controversa reflected a major Chinese concern that T. controversa had the potential to cause a widespread dwarf bunt epidemic of wheat in China. Thus, the objective of this study was to determine if agricultural lands in China's winter wheat region possessed an important climatic factor (30-day persistent snow cover) regularly associated with this disease. Weather satellite based NOAA/NESDIS snow and ice charts were used to locate the snow areas occurring on agricultural lands. The agricultural lands were identified using Landsat multispectral scanner imagery. During the period November 1966 through February 1982, 11 instances of persistent snow cover were identified; these occurred in 7 out of the 16 yrs. One area had snow during only 1 yr, four areas had snow during 2 sequential years, and nine areas had snow cover during more than 1 nonsequential yr. Therefore, in China's major winter wheat region the potential sites for the dwarf bunt disease of wheat were rare in time and space, and it appears exceedingly unlikely that a widespread development of this disease could ever occur in China.

Key Words: Remote sensing • Landsat • Snow cover • Tilletia controversa • Triticum species

1 Research supported by U.S. Wheat Associates and ARS-USDA. Technical Paper no. 7284 of the Oregon Agric. Exp. Stn. Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the USDA and does not imply approval to the exclusion of other products that also may be suitable.

2 Research plant pathologist, ARS-USDA, Dep. of Botany and Plant Pathology, Oregon State Univ. Corvallis, OR 97331; and senior research assistant, Environmental Remote Sensing Applications Lab., Oregon State Univ., Corvallis, OR 97331.

Received for publication September 20, 1984.




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Copyright © 1986 by the American Society of Agronomy.