Leaf spot diseases on currants in Finland: their significance and control by organic methods and fungicides
2002
Parikka, P. | Kivijärvi, P. | Virolainen, J. | Aaltonen, M.
The possibility of better disease control by timing the treatments according to the infection risk was investigated on black and red currants in summer 2000 on two research fields in Finland. Anthrachnose (Drepanopeziza ribis) was the most important pathogen on red currant and Septoria leaf spot (Septoria ribis) on black currant. The fungicides applied were tolylfluanid (Euparen M) and penconazol (Topas 100 EC). The applications were made according to normal practice before and after flowering. One extra treatment during full bloom had a good effect on red currant and was comparable to the prolonged spraying programme. Spraying according to disease alert did not give a good result on black currant because of dry weather during the blossom period. Treatments with compost extract and nettle extract had an effect on leaf diseases (anthrachnose and Septoria leaf spot) and yields of white currant during the two-year organic cultivation experiment.
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