The race structure of the sunflower broomrape ( Orobanche cumana Wallr.) is identified for the populations of Stavropol krai, Rostov and Volgograd oblasts, and Krasnodar krai. A wide distribution of the most virulent races F, G, and H is observed. A high percentage of the races G and H is revealed for some districts.
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Antonova et al. (2013) studied this question.
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