Alternative fungicides for controlling husk spot caused by Pseudocercospora macadamiae in macadamia

Akinsanmi, Olufemi A., Miles, A. K. and Drenth, Andre (2008) Alternative fungicides for controlling husk spot caused by Pseudocercospora macadamiae in macadamia. Australasian Plant Pathology, 37 2: 141-147.


Author Akinsanmi, Olufemi A.
Miles, A. K.
Drenth, Andre
Title Alternative fungicides for controlling husk spot caused by Pseudocercospora macadamiae in macadamia
Journal name Australasian Plant Pathology   Check publisher's open access policy
ISSN 0815-3191
1448-6032
Publication date 2008
Sub-type Article (original research)
DOI 10.1071/AP08001
Volume 37
Issue 2
Start page 141
End page 147
Total pages 7
Place of publication Collingwood, Vic.
Publisher CSIRO
Collection year 2009
Language eng
Subject 060704 Plant Pathology
C1
960413 Control of Plant Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland Environments
Abstract Husk spot, caused by Pseudocercospora macadamiae is a major fungal disease of macadamia in Australia. Chemicals to control the disease are limited and frequent failure to control the disease is a major concern to growers. The overall goal of this research was to improve the chemical control strategy of P. macadamiae through the provision of fungicides with different modes of action to carbendazim, which is the current industry standard. Husk spot incidence, premature fruit abscission, kernel quality and yield were evaluated following application of different fungicide products in replicated field experiments at three different sites. Results showed significant differences in disease incidence and premature fruit abscission between fungicide treatments, field sites and years. Generally, disease incidence and premature fruit abscission on trees treated with fungicide were significantly (P < 0.05) lower than the untreated control. Pyraclostrobin conferred significantly better protection than trifloxystrobin, reducing disease severity by 70% compared with a 50% reduction by trifloxystrobin. The pyraclostrobin treatment had a similar efficacy to the current industry standard (70% reduction cf. 73% reduction by tank-mixed carbendazim and copper). Higher amounts of immature kernels occurred in the untreated control, followed by difenoconazole and trifloxystrobin. Diseased fruit accounted for 78% of premature fruit abscission, which indicates that husk spot enhances fruit abscission in macadamia. Our results suggest that pyraclostrobin provided similar efficacy to the industry standard and could, therefore, play a key role in the management of husk spot.
Keyword disease progress curve
Mycosphaerellaceae
nut
strobilurin
Q-Index Code C1
Q-Index Status Provisional Code

 
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Created: Fri, 19 Dec 2008, 09:45:34 EST by Diana Guillemin on behalf of School of Biological Sciences