New Zealand Journal of Crop and Horticultural Science abstracts
Seed-borne cucumber mosaic virus in New Zealand lentil crops: yield effects
and disease incidence
J. D. FLETCHER
A. C. RUSSELL
R. C. BUTLER
New Zealand Institute for Crop & Food
Research Limited
Private Bag 4704
Christchurch, New Zealand
Abstract Cucumber mosaic virus (CMV) has been detected in
lentil (
Lens culinaris L.) seed grown in New Zealand. In 1994
experimental plots of lentil plants `Rajah' inoculated with CMV yielded 15%
less seed than uninoculated. In 1995, seed losses were similar for `Rajah' and
`Titore', but losses were greater at 17 and 19%, respectively. Plant numbers
were also reduced by CMV infection--by 18% in `Rajah' and 7% in `Titore'.
Thousand seed weight was not affected by infection. Surveys of commercial
lentil seed lines detected CMV incidences of between 0.05 and 2.5%. In a field
experiment in 1996, using four levels of seed-borne CMV (0, 0.5, 1, and 2%)
obtained by blending infected and healthy seed, mean seed-borne incidences in
harvested material of between 1.5 and 6% were recorded. No reductions in seed
weight or subsequent germination rate were recorded. Plant numbers were
slightly reduced by seed-borne CMV. Transmission of CMV from infected seed was
measured. A linear relationship was observed from 1% transmission in plots sown
with clean seed to 4.9% transmission in plots sown with seed having a 2% level
of infection.
Keywords cucumber mosaic virus; seed-borne virus; yield loss;
statistical analysis; generalised linear model; lentil
H99003
Received 14 January 1999; accepted 15 June 1999
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