New Zealand Journal of Agricultural Research abstracts
Estimating the agronomic impact of white clover mosaic virus on white clover
performance in the North Island of New Zealand
B. DUDAS
D. R. WOODFIELD
P. M. TONG
M. F. NICHOLLS
G. R. COUSINS
R. BURGESS
D. W. R. WHITE
AgResearch Grasslands
Private Bag 11 008
Palmerston North, New Zealand
D. L. BECK
T. J. LOUGH
R. L. S. FORSTER
HortResearch
Private Bag 92 169
Auckland, New Zealand
Abstract The agronomic impact of white clover mosaic
potexvirus (WClMV) was determined using yield trials and a survey of virus
incidence. The virus was shown to occur at high levels in white clover plants
in pastures throughout the North Island. The virus was detected in 69% of white
clover plants from 42 mature pastures examined (>4 years old) and in 52% of
white clover plants examined on roadsides. The virus was also detected in 15
pastures less than 4 years old, but at a lower level (18% infection). The
effect of WClMV on plant growth was determined using clonal and non-clonal
lines of the modern white clover cv. Grasslands Tahora in a replicated spaced
plant field trial. Uninoculated plants were shown to out-produce inoculated
plants at each of three harvest dates over one year. Infected plants produced,
in total, 36.5% less dry matter than uninoculated plants. The major effect of
WClMV infection was on stolon elongation, with lesser effects on leaf length
and petiole height. These results indicate that substantial gains can be
expected from cultivars resistant to this pathogen.
Keywords white clover; white clover mosaic virus; virus
incidence; dry matter production; economic importance
New Zealand Journal of Agricultural Research, 1998, Vol. 41: 171-178
0028-8233/98/4102-0171 $7.00/0 (c) The Royal Society of New Zealand
1998
PDF file of entire paper: medium quality (606K); (scanned from paper original: notes about this process)
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