New Zealand Journal of Crop and Horticultural Science abstracts
Laboratory evaluation of sweetpotato (Ipomoea batatas) resistance
to sclerotinia rot
P. J. Wright
New Zealand Institute for Crop & Food
Research Limited
Cronin Road, RD1
Pukekohe, New Zealand
email: wrightp@crop.cri.nz
S. L. Lewthwaite
New Zealand Institute for Crop & Food
Research Limited
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
C. M. Triggs
Department of Statistics
University of Auckland
Private Bag 92 019
Auckland, New Zealand
P. G. Broadhurst†
New Zealand Institute for Crop & Food
Research Limited
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
† Deceased.
Dedication This paper is dedicated to Philip G. Broadhurst (1963-99),
who initiated the research that this paper describes.
Abstract Sweetpotato (Ipomoea batatas) resistance
to sclerotinia rot (pink rot), caused by the fungus Sclerotinia sclerotiorum,
was evaluated using a laboratory technique. Excised stem lengths of four commercial
sweetpotato cultivars were pierced, then inoculated with mycelial disks from
S. sclerotiorum cultures. The inoculated stems were incubated in moist
chambers for 48 h at 20°C and then assessed for rot severity. Of the
four cultivars, ‘Toka Toka Gold’ was most susceptible to the fungus and ‘Beauregard’
most resistant. The cultivars ‘Owairaka Red’ and ‘Northland Rose’ had moderate
levels of resistance. Correlations between laboratory and field results were
good for ‘Toka Toka Gold’ and ‘Beauregard’. Although plant growth habit affected
the disease responses of ‘Owairaka Red’ and ‘Northland Rose’, laboratory
and field results for these cultivars were similar. Laboratory tests will
prove useful in determining the level of disease resistance in diverse sweetpotato
germplasm.
Keywords sweetpotato; Ipomoea batatas; pink rot;
sclerotinia rot; Sclerotinia sclerotiorum; disease resistance; cultivars
H02036 Received 22 May 2002; accepted 28 October 2002; published 26 March
2003
New Zealand Journal of Crop and Horticultural Science, 2003, Vol. 31:
33-39
0014-0671/03/3101-0033 $7.00 © The Royal Society of New Zealand
2003
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