New Zealand Journal of Crop and Horticultural Science abstracts
Further investigations of the black currant reversion disease in New
Zealand
G. A. WOOD
The Horticulture and Food Research
Institute of New Zealand Ltd
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
email: rforster@hort.cri.nz
G. I. LANGFORD
The Horticulture and Food Research
Institute of New Zealand Ltd
Canterbury Research Centre
P. O. Box 51
Lincoln, New Zealand
Abstract An evaluation of several black currant (
Ribes
nigrum L.) cultivars recommended or suggested as indicators for the
reversion disease, showed `Baldwin' to be the most sensitive. `Kentish Hero'
and `Silvergieters Schwarze' were almost as sensitive as `Baldwin', but
`Ojebyn' did not express definitive symptoms. A virulent strain of reversion
found in the cultivar `Kentish Hero' appears similar to the V1 strain reported
in England. Moderate, and possibly mild, strains occurred in several other
cultivars. However, the severe "R" form of the disease causing the split sepal
symptom of black currants in Scandinavia and Eastern Europe does not appear to
be present in New Zealand. Surveys in 1990, 1991, and 1996 of commercial
properties growing black currants in the South Island showed that reversion was
present in several plantings in South Canterbury and Otago, and was widespread
in Southland plantings. A low incidence of reversion in Nelson is thought to
have been eliminated by the removal of infected plants. North Canterbury
plantings remain free from infection, but infection has appeared at two
locations in mid Canterbury. Spread of infection between properties was
initially caused through the inadvertent use of infected propagation material,
and further spread within properties by the gall mite (
Cecidophyopis ribis
Westw.) vector. The use of gall mite resistant cultivars appears to be the
only effective means for the control of reversion.
Keywords Ribes; black currants; reversion disease;
indicator cultivars; strains; reversion survey
H98017
Received 30 March 1998; accepted 16 June 1998
PDF file of entire paper: medium quality (773K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
