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Timing of fungicide applications for control of husk spot caused by Pseudocercospora macadamiae in macadamia

Akinsanmi, O.A. and Miles, A.K. and Drenth, A. (2007) Timing of fungicide applications for control of husk spot caused by Pseudocercospora macadamiae in macadamia. Plant Disease, 91 (12). pp. 1675-1681.

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Article Link(s): http://dx.doi.org/10.1094/PDIS-91-12-1675

Publisher URL: http://apsjournals.apsnet.org

Abstract

Pseudocercospora macadamiae is an important pathogen of macadamia in Australia, causing a disease known as husk spot. Growers strive to control the disease with a number of carbendazim and copper treatments. The aim of this study was to consider the macadamia fruit developmental stage at which fungicide application is most effective against husk spot, and whether application of copper-only applications at full-size fruit developmental stage toward the end of the season contributed to effective disease control. Fungicides were applied to macadamia trees at four developmental stages in three orchards in two subsequent production seasons. The effects of the treatments on disease incidence and severity were quantified using area under disease progress curve (AUDPC) and logistic regression models. Although disease incidence varied between cultivars, incidence and severity on cv. A16 showed consistent differences between the treatments. Most significant reduction in husk spot incidence occurred when spraying commenced at match-head sized-fruit developmental stage. All treatments significantly reduced husk spot incidence and severity compared with the untreated controls, and a significant positive linear relationship (R2 = 73%) between AUDPC and severity showed that timing of the first fungicide application is important for effective disease control. Application of fungicide at full-size fruit stage reduced disease incidence but had no impact on premature fruit drop.

Item Type:Article
Additional Information:© The American Phytopathological Society.
Keywords:Chemical control; disease management; fungi; M. tetraphylla Macadamia integrifolia; tree nut.
Subjects:Science > Botany > Cryptogams
Plant culture > Fruit and fruit culture > Nuts
Plant pests and diseases > Individual or types of plants or trees
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
Deposited On:10 Nov 2008 06:48
Last Modified:10 Jun 2011 01:45

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