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Yield losses in grain sorghum due to rust infection

White, J. A. and Ryley, M. J. and George, D. L. and Kong, G. A. and White, S. C. (2012) Yield losses in grain sorghum due to rust infection. Australasian Plant Pathology, 41 (1). pp. 85-91. ISSN 0815-3191

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Article URL: http://dx.doi.org/10.1007/s13313-011-0093-3

Abstract

Although rust (caused by Puccinia purpurea) is a common disease in Australian grain sorghum crops, particularly late in the growing season (April onwards), its potential to reduce yield has not been quantified. Field trials were conducted in Queensland between 2003 and 2005 to evaluate the effect of sorghum rust on grain yield of two susceptible sorghum hybrids (Tx610 and Pride). Rust was managed from 28-35 days after sowing until physiological maturity by applying oxycarboxin (1 kg active ingredient/100 L of water/ha) every 10 days. When data were combined for the hybrids, yield losses ranged from 13.1% in 2005 to 3.2% in 2003 but differences in yield the between sprayed and unsprayed treatments were statistically significant (P a parts per thousand currency signaEuro parts per thousand 0.05) only in 2005. Final area under the disease progress curve (AUDPC) values reflected the yield losses in each year. The higher yield loss in 2005 can be attributed primarily to the early development of the rust epidemic and the higher inoculum levels in spreader plots at the time of planting of the trials.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:White, Jodie A. Ryley, Malcolm J. George, Doug L. Kong, Gary A. White, Simon C.
Subjects:Plant culture > Field crops > Sorghum
Plant pests and diseases > Plant pathology
Deposited On:04 Feb 2014 02:47
Last Modified:04 Feb 2014 02:47

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