ISHS Acta Horticulturae 777: IX International Rubus and Ribes Symposium
DISEASE CONTROL ON CURRANTS |
| Authors: | P. Parikka, M. Aaltonen, S. Hakolahti |
| Keywords: | Ribes spp., Drepanopeziza ribis, Septoria ribis, leaf diseases, chemical control |
| Abstract:
Leaf spot diseases are most harmful on red and white currants and disease control is used on those species. Anthracnose (Drepanopeziza ribis) is the most important disease, but it has seldom been detected on black currant. Septoria ribis causes leaf spot on all currants. Optimisation of chemical control on red, white and black currant was studied in 2001 on cultivars ‘Öjebyn’ (black currant), ‘Red Dutch’ (red currant) and ‘White Dutch’ (white currant). Alternative control strategies were compared with untreated control plots and plots where leaf spot diseases were controlled by frequent sprays during spring and summer. The approved treatment includes spraying before and after flowering. It was compared with a spraying programme with one additional treatment at full bloom and another programme with spraying according to estimated infection risk. Spraying according to the estimated infection risk did not improve the efficiency of chemical control. Spraying at full bloom increases the effect of traditional treatments and it also affects grey mould infection of flowers. Chemical control has some effect on fruit size and yield, as well as sugar content, but the differences observed in these trials were not significant. Weather conditions during the growing season affected disease development more than chemical control measures. | |
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