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Evaluation of the efficacy and economics of irrigation management, plant resistance and Brassica(spot)(TM) models for management of white blister on Brassica crops

Minchinton, E. J. and Auer, D. P. F. and Thomson, F. M. and Trapnell, L. N. and Petkowski, J. E. and Galea, V. and Faggian, R. and Kita, N. and Murdoch, C. and Kennedy, R. (2013) Evaluation of the efficacy and economics of irrigation management, plant resistance and Brassica(spot)(TM) models for management of white blister on Brassica crops. Australasian Plant Pathology, 42 (2). pp. 169-178. ISSN 0815-3191

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Article Link(s): http://dx.doi.org/10.1007/s13313-012-0181-z

Abstract

Options for the integrated management of white blister (caused by Albugo candida) of Brassica crops include the use of well timed overhead irrigation, resistant cultivars, programs of weekly fungicide sprays or strategic fungicide applications based on the disease risk prediction model, Brassica(spot)(TM). Initial systematic surveys of radish producers near Melbourne, Victoria, indicated that crops irrigated overhead in the morning (0800-1200 h) had a lower incidence of white blister than those irrigated overhead in the evening (2000-2400 h). A field trial was conducted from July to November 2008 on a broccoli crop located west of Melbourne to determine the efficacy and economics of different practices used for white blister control, modifying irrigation timing, growing a resistant cultivar and timing spray applications based on Brassica(spot)(TM). Growing the resistant cultivar, 'Tyson', instead of the susceptible cultivar, 'Ironman', reduced disease incidence on broccoli heads by 99 %. Overhead irrigation at 0400 h instead of 2000 h reduced disease incidence by 58 %. A weekly spray program or a spray regime based on either of two versions of the Brassica(spot)(TM) model provided similar disease control and reduced disease incidence by 72 to 83 %. However, use of the Brassica(spot)(TM) models greatly reduced the number of sprays required for control from 14 to one or two. An economic analysis showed that growing the more resistant cultivar increased farm profit per ha by 12 %, choosing morning irrigation by 3 % and using the disease risk predictive models compared with weekly sprays by 15 %. The disease risk predictive models were 4 % more profitable than the unsprayed control.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Thomson, F. M. Trapnell, L. N. Petkowski, J. E. Galea, V. Faggian, R. Kita, N. Murdoch, C. Kennedy, R. Horticulture Australia Ltd [VG01045, VG07070]; Federal Government of Australia; State Government of Victoria This research was conducted with funding from Horticulture Australia Ltd (under Project Codes VG01045 and VG07070), the Federal Government of Australia and the State Government of Victoria. We thank the vegetable growers for supplying plant material and field sites, and Department of Primary Industries Victoria extension officer Mr Mark Hincksman for liaising with growers. Dr Robert Emmett and Dr Rudolf deBoer are thanked for reviewing of the manuscript. Seedlings of broccoli cv. 'Tyson' and cv. 'Ironman' used in the field trial were supplied courtesy of Boomaroo Nurseries Ltd., Lara, Victoria. Springer Dordrecht
Keywords:White blister Brassica(spot)(TM) Radish Broccoli Integrated disease management rust albugo-candida mustard juncea
Subjects:Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Plant culture > Vegetables
Plant pests and diseases > Plant pathology
Deposited On:02 Oct 2014 05:00
Last Modified:24 Feb 2015 01:47

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