Field studies on the effectiveness of phosphonate suppression of phytophthora root rot in proteas

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Turnbull, L.V. and Crees, L.R. (1995) Field studies on the effectiveness of phosphonate suppression of phytophthora root rot in proteas. Acta Horticulturae (387). pp. 141-152. ISSN 0567-7572

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Article Link: http://dx.doi.org/10.17660/ActaHortic.1995.387.16

Abstract

Phosphonate suppression of root rot in proteas, caused by Phytophthora cinnamomi, was tested in field trials over a two-year period. Effectiveness of chemical control varied, dependent upon plant species, site topography, soil moisture content and soil temperature.
Phosphonate, applied as a foliar spray at 1.2 g a.i.l-1 at 6 weekly intervals, resulted in 100% plant survival (cƒ 19% in unsprayed control plants) in Leucadendron ‘Sylvan Red’ and 75% survival in Leucospermum ‘Firewheel’ (cƒ 44% in unsprayed plants). Under site conditions conducive to high disease pressure, increased spraying intensity (3 weekly, 2.4 g a.i.l-1) did not prevent infection (81% of plants) and death (50%) of Leucospermum ‘Firewheel’ by P. cinnamomi.

Item Type:	Article
Corporate Creators:	Department of Agriculture and Fisheries, Queensland
Business groups:	Horticulture and Forestry Science
Subjects:	Plant culture > Flowers and flower culture. Ornamental plants Plant pests and diseases
Live Archive:	08 Feb 2024 05:14
Last Modified:	08 Feb 2024 05:14

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