New Zealand Journal of Agricultural Research abstracts
Influence of phenology, defoliation, and Sclerotinia sclerotiorum on
regrowth potential of Ranunculus acris
S. GREEN*
R. E. GAUNT
Department of Plant Science
P. O. Box 84
Lincoln University
Lincoln, New Zealand
G. W. BOURDÔT
AgResearch
P. O. Box 60
Lincoln, New Zealand
R. J. FIELD
Department of Plant Science
P. O. Box 84
Lincoln University
Lincoln, New Zealand
*Present address: Agriculture and Agri-food Canada Research Centre,
Saskatoon, Saskatchewan, Canada.
Abstract The biomass and carbohydrate availability of the
crown of a herbicide-resistant biotype of Ranunculus acris were studied
at six phenological stages from pre- to post-flowering. The crown biomass and
amounts of available carbohydrate were the least at pre-flowering, and
increased during the flowering period. The regenerative potential of the crown
of R. acris after infection by Sclerotinia sclerotiorum was
studied at four phenological stages. Regeneration was least after treatment at
pre-flowering, and greatest after treatment at late-flowering. The effect of
repeated defoliation on regrowth, crown biomass, amount of crown available
carbohydrate, and vulnerability to S. sclerotiorum, was evaluated.
Six-month-old plants regrew after repeated defoliation without depletion of
crown biomass or crown available carbohydrate. In contrast, regrowth of
two-year-old plants declined after repeated defoliation, and the crown biomass
and available carbohydrate reserves were depleted. Repeated defoliation reduced
the potential of plants to regenerate following infection by S.
sclerotiorum. No period of major reserve depletion was identified for
control with S. sclerotiorum, but repeated defoliation before
inoculation may provide better control than inoculation alone.
Keywords Sclerotinia sclerotiorum; mycoherbicide; Ranunculus
acris; regenerative potential
New Zealand Journal of Agricultural Research, 1998, Vol. 41: 125-133
0028-8233/98/4101-0125 $7.00/0 (c) The Royal Society of New Zealand
1998
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