Galling and reversion disease incidence in a range of blackcurrant genotypes, differing in resistance to the blackcurrant gall mite (Cecidophyopsis ribis) and blackcurrant reversion disease

Citation
At. Jones et al., Galling and reversion disease incidence in a range of blackcurrant genotypes, differing in resistance to the blackcurrant gall mite (Cecidophyopsis ribis) and blackcurrant reversion disease, ANN AP BIOL, 133(3), 1998, pp. 375-384
Citations number
23
Categorie Soggetti
Biology
Journal title
ANNALS OF APPLIED BIOLOGY
ISSN journal
00034746 → ACNP
Volume
133
Issue
3
Year of publication
1998
Pages
375 - 384
Database
ISI
SICI code
0003-4746(199812)133:3<375:GARDII>2.0.ZU;2-W
Abstract
An assessment was made of the response of 10 blackcurrant genotypes, differ ing in resistance to the agent of blackcurrant reversion disease (BRD) and to its gall mite vector, in field trials in Scotland and Finland over 5 yr. At each location, the 10 genotypes were planted in plots containing infect or plants with high inoculum levels of the two organisms. In Scotland, the infector plants contained large numbers of gall mites (Cecidophyopsis ribis ) and were infected with the European (E) form of BRD; in Finland, infector plants contained a different species of gall mite (C. spicata) and the sev ere Russian form (R) of BRD. As expected, at both sites, almost all plants of cvs Ben Alder, Ben Lomond, Ben Tirran, Ojebyn and an SCRI selection F4/1 /66, which are susceptible to gall mite and BRD, became infested with each of these organisms. However, in Scotland but not in Finland, 58% of cv. Oje byn plants were affected by BRD. The cv. Foxendown, which contains gene Ce that confers apparent immunity to C. ribis, was free from galls and failed to develop distinctive BRD symptoms at both sites. The cvs Rus and Neosypaj uscajaija, which contain gene P which is reported to confer resistance to C . ribis, were infested more slowly by mites than the mite-susceptible genot ypes and showed a smaller number of galls per plant. Also, they were infect ed with BRD more slowly than some mite-susceptible genotypes although by th e end of the experiment, most plants were affected by BRD. All plants of cv s Golubka and Ben Gairn, which are resistant to the agent of BRD, remained free from distinct BRD symptoms at both sites despite the fact that plants contained galls. These data indicate the superiority of gene Ce over gene P for resistance to gall mites with the added benefit that the virtual immun ity to gall mites provided by gene Ce provides a high level of protection a gainst infection with BRD. The relative merits of these different forms of resistance to gall mites and BRD in blackcurrant are discussed in relation to present control methods for these two organisms and in the light of rece nt findings of different species of eriophyid mites on Ribes species.