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Phosphonate applied as a pre-plant dip controls Phytophthora cinnamomi root and heart rot in susceptible pineapple hybrids.

Anderson, J.M. and Pegg, K.G. and Scott, C. and Drenth, A. (2012) Phosphonate applied as a pre-plant dip controls Phytophthora cinnamomi root and heart rot in susceptible pineapple hybrids. Australasian Plant Pathology, 41 (1). pp. 59-68.

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Article Link(s): http://dx.doi.org/10.1007/s13313-011-0090-6

Publisher URL: http://www.springerlink.com

Abstract

The effectiveness of pre-plant dips of crowns in potassium phosphonate and phosphorous acid was investigated in a systematic manner to develop an effective strategy for the control of root and heart rot diseases caused by Phytophthora cinnamomi in the pineapple hybrids 'MD2' and '73-50' and cultivar Smooth Cayenne. Our results clearly indicate that a high volume spray at planting was much less effective when compared to a pre-plant dip. 'Smooth Cayenne' was found to be more resistant to heart rot than 'MD2' and '73-50', and 'Smooth Cayenne' to be more responsive to treatment with potassium phosphonate. Based on cumulative heart rot incidence over time 'MD2' was more susceptible to heart rot than '73-50' and was more responsive to an application of phosphorous acid. The highest levels of phosphonate in roots were reached one month after planting and levels declined during the next two months. Pre-plant dipping of crowns prior to planting is highly effective to control root and heart rot in the first few months but is not sufficient to maintain health of the mother plant root system up until plant crop harvest when weather conditions continue to favour infection.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development & Innovations (DEEDI), Agri-Science, University of Queensland
Business groups:Agri-Science
Additional Information:© Australasian Plant Pathology Society Inc. 2011
Keywords:Chemical control; crown; dipping; disease incidence; disease resistance; fungal diseases; fungicides; hybrid varieties; phosphonates; phosphoric acid; pineapples; plant disease control; plant diseases; plant pathogenic fungi; plant pathogens; roots; Ananas comosus; fungi; Queensland; Australia.
Subjects:Plant culture > Horticulture. Horticultural crops
Plant pests and diseases
Deposited On:27 Feb 2012 02:35
Last Modified:27 Feb 2012 02:35

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