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Crop damage from Sclerotinia crown rot and risk factors in pyrethrum
Citation
Scott, JB and Gent, DH and Pethybridge, SJ and Groom, T and Hay, FS, Crop damage from Sclerotinia crown rot and risk factors in pyrethrum, Plant Disease, 98, (1) pp. 103-111. ISSN 0191-2917 (2014) [Refereed Article]
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Copyright Statement
Copyright 2014 The American Phytopathological Society
DOI: doi:10.1094/PDIS-06-13-0599-RE
Abstract
Sclerotinia crown rot, caused by Sclerotinia sclerotiorum and S. minor,
is a prevalent disease in pyrethrum fields in Australia. Management
involves fungicide applications during the rosette stage of plant development
from autumn to early spring in fields approaching first harvest.
However, estimates of crop damage and the efficacy of these tactics are
poorly understood; therefore, plots were established in 86 pyrethrum
fields in Tasmania, Australia during 2010 to 2012 to quantify these and
to identify risk factors for disease outbreaks. On average, commercial
management for Sclerotinia crown rot reduced disease incidence 43 to
67% compared with nontreated plots. There was a weak but significant
relationship between relative increase in flower yield when fungicides
were applied and the incidence of crown rot (R2 = 0.09, P = 0.006),
although the mean number of flowers produced was similar regardless
of fungicide applications. Flower yield was positively associated with
canopy density in spring (S = 0.39, P = 0.001). Moreover, canopy
density in spring was linked by both direct and indirect effects to canopy
density during autumn and winter which, in turn, were associated
with planting date and previous rain events. Modeling canopy density
and disease incidence in autumn correctly categorized disease incidence
in spring relative to a threshold of 2% in 72% of fields. In a
subset of 22 fields monitored over 2 years, canopy density in the autumn
following the first harvest had a negative relationship with
Sclerotinia crown rot incidence the preceding year (R2 = 0.23, P =
0.006). On average, however, current commercial management efforts
provided only small increases in flower yield in the current season and
appear best targeted to fields with well-developed plant canopies and
Sclerotinia crown rot present during early autumn.
Item Details
Item Type: | Refereed Article |
---|---|
Research Division: | Agricultural, Veterinary and Food Sciences |
Research Group: | Horticultural production |
Research Field: | Horticultural crop protection (incl. pests, diseases and weeds) |
Objective Division: | Plant Production and Plant Primary Products |
Objective Group: | Horticultural crops |
Objective Field: | Horticultural crops not elsewhere classified |
UTAS Author: | Scott, JB (Dr Jason Scott) |
UTAS Author: | Gent, DH (Dr David Gent) |
UTAS Author: | Pethybridge, SJ (Dr Sarah Pethybridge) |
UTAS Author: | Hay, FS (Dr Frank Hay) |
ID Code: | 87840 |
Year Published: | 2014 |
Funding Support: | Australian Research Council (LP1010529) |
Web of Science® Times Cited: | 5 |
Deposited By: | Tasmanian Institute of Agriculture |
Deposited On: | 2013-12-10 |
Last Modified: | 2017-11-06 |
Downloads: | 0 |
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