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Reduced fungicide use on a new Australian peanut cultivar, highly resistant to the late leaf spot and rust pathogens

Kelly, L. A. and Ryley, M. J. and Trevorrow, P. R. and Tatnell, J. R. and Nastasi, C. and Chauhan, Y. (2012) Reduced fungicide use on a new Australian peanut cultivar, highly resistant to the late leaf spot and rust pathogens. Australasian Plant Pathology, 41 (4). pp. 359-373. ISSN 0815-3191

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Article Link(s): http://dx.doi.org/10.1007/s13313-012-0132-8

Abstract

Rust (caused by Puccinia arachidis) and late leaf spot (LLS, caused by Mycosphaerella berkeleyi) can cause significant yield losses in Australian peanut crops. Until recently, all commercial peanut varieties were highly susceptible to these pathogens, but the new Australian cultivar Sutherland has significantly higher levels of resistance than the older cultivars. Field trials were conducted at two sites in Queensland to (a) confirm the improved resistance of cv. Sutherland over another commercial cultivar, Menzies, (b) study the effects of timing of first spray, spray interval and cultivar on disease severity and yield, and (c) develop a suitable fungicide management program for cv. Sutherland. In the 2006 and 2007 trials, rust and LLS developed slower and had lower final disease ratings and AUDPC values on unsprayed plots of cv. Sutherland than on cv. Menzies. The timing of the first spray is critical in managing both rust and late leaf spot, with the results demonstrating that the first fungicide spray on cv. Sutherland should be applied as soon as rust and LLS are first seen on cv. Menzies. In most trials spray intervals of 14 days or 21 days were suitable to effectively control rust and LLS. In years with low disease pressure, few, if any, fungicide applications will be needed to manage the diseases, but in other years up to four sprays may be necessary. © Australasian Plant Pathology Society Inc. 2012.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Chemical control; crop yield; cultivars; disease resistance; fungal diseases; fungicides; groundnuts; new cultivars; plant disease control; plant diseases; plant pathogenic fungi; plant pathogens; cultivated varieties; fungistats; fungus; peanuts; phytopathogenic fungi; phytopathogens; plant-pathogenic fungi; resistance to disease; Queensland; Australia.
Subjects:Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Plant pests and diseases > Plant pathology
Deposited On:08 Apr 2014 03:50
Last Modified:08 Apr 2014 03:50

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