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Summary The presented studies concern an evaluation of 10 potato cultivars (5 starch and 5 table) and 9 selected potato breeding lines regarding their resistance against Phytophthora infestans as well as other traits such as length of vegetation period, yield, tuber size, regularity of tuber shape, depth of eyes. The aim of these studies was to evaluate of the potential usefulness of tested potato cultivars/clones for organic farming. The obtained results indicate that none of the tested table cultivars should be recommended for organic farming, due to their low resistance to P. infestans. The examined starch cultivars show high resistance to P. infestans, but their cultivation in organic farming seems to be restricted due to other features’ for example very long vegetation period. On the contrary, the group of tested potato breeding lines seems to be very useful for organic farming since they are high yielding and display relatively short vegetation period and high resistance to P. infestans. Moreover, these clones produce tubers with an attractive tuber appearance that is indispensable for table potatoes.

progress in plant protection

Evaluation of selected Polish potato cultivars and breeding lines regarding their resistance against Phytophthora infestans and usefulness for organic farming