Yield losses in grain sorghum due to rust infection

White, Jodie A. and Ryley, Malcolm J. and George, Doug L. and Kong, Gary A. and White, Simon C. (2012) Yield losses in grain sorghum due to rust infection. Australasian Plant Pathology, 41 (1). pp. 85-91. ISSN 0815-3191

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≥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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © Australasian Plant Pathology Society Inc. 2011. Permanent restricted access to published version, due to publisher's copyright policy (Springer).
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 29 Nov 2012 07:56
Last Modified: 03 Jul 2013 01:32
Uncontrolled Keywords: AUPDC; oxycarboxin; puccinia purpurea; rust severity; sorghum bicolor
Fields of Research (FOR2008): 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070107 Farming Systems Research
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective (SEO2008): B Economic Development > 82 Plant Production and Plant Primary Products > 8204 Summer Grains and Oilseeds > 820404 Sorghum
Identification Number or DOI: doi: 10.1007/s13313-011-0093-3
URI: http://eprints.usq.edu.au/id/eprint/22200

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