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Timing of infection of macadamia fruit by Pseudocercospora macadamiae and climatic effects on growth and spore germination.

Miles, A.K. and Akinsanmi, O.A. and Aiken, E.A.B. and Drenth, A. (2010) Timing of infection of macadamia fruit by Pseudocercospora macadamiae and climatic effects on growth and spore germination. Australasian Plant Pathology, 39 (5). pp. 453-462.

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Article Link(s): http://dx.doi.org/10.1071/AP10001

Publisher URL: http://www.publish.csiro.au

Abstract

Pseudocercospora macadamiae causes husk spot of macadamia. Husk spot control would be improved by verifying the stages in fruit development susceptible to infection, and determine some of the climatic conditions likely to lead to high disease pressure periods in the field. Our results showed that the percent conidia germination and growth of germ tubes and mycelia of P. macadamiae were greatest at 26 degrees C, with better conidia germination associated with high relative humidity and free water. The exposure of match-head-sized and pea-sized fruit stages to natural P. macadamiae inoculum in the field led to 2 5-fold increases in husk spot incidence, and up to 8.5-fold increases in premature abscission, compared with unexposed fruit. Exposure of fruit stages later than match-head-sized and pea-sized fruit generally caused no further increases in disease incidence or premature abscission. Climatic conditions were found to have a strong influence on the behaviour of P. macadamiae, the host, oil accumulation, and the subsequent impact of husk spot on premature abscission. Our findings suggest that fungicide application should target fruit at the match-head-sized stage of development in order to best reduce yield losses, particularly in seasons where oil accumulation in fruit is prolonged and climatic conditions are optimal for P. macadamiae.

Item Type:Article
Corporate Creators:DEEDI
Additional Information:© CSIRO.
Keywords:Hyphomycete; Proteaceae; husk spot; leaf; classification; temperature; sporulation; quality; models; blight; nuts.
Subjects:Plant culture > Fruit and fruit culture > Nuts
Plant pests and diseases
Deposited On:25 Oct 2010 05:42
Last Modified:29 Mar 2011 01:36

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