Sources of spring common wheat resistance to powdery mildew

Effective breeding work to create disease-resistant wheat varieties provides for regional, retrospective studies determine effective sources of resistance. One the most harmful and globally significant diseases is powdery mildew. In conditions Tatarstan, located in Volga economic region Russia, mass development mildew on spring common noted annually, regardless prevailing weather conditions. The high natural infectious background allows us objectively differentiate samples by disease purpose our research was search resistance among VIR collection, which retain stability a long time. were conducted period from 2011 2021. total, during entire period, 702 studied Pre-Kama zone Republic Tatarstan. reaction evaluated population fungus Blumeria graminis f. sp. tritici, caused wheat. screening 2020 allowed identify field that their effectiveness time: Tybalt (k-64897, Netherlands), Zebra (k-64707, Sweden), CH Rubli (k-65003, Germany), Visa (k-64390, Belarus). During this there decrease 3.5 points 2011-2015 4.6 2016-2020 (on 9-point scale). At varietals: Toma (k-66193), Sudarynya (k-6647), Laska (k-66421) Belarus; KWS Torridon (k-66273, UK); Netherlands); Griwa (k-66701), Zura (k-66702) Poland; Florens (k-66391, France); Odeta (66394, Czech Republic); Lavett (k-66095), Boett (k-66353) Sweden no symptoms recorded 2019-2021. collection Russian countries former USSR (except Belarus) poor resistant varieties, only two Barakat Sitara Tatarstan turned out be highly resistant. Resistant B. mainly originate European part world (band: Great Britain ?Belarus), approximately geographical coordinates - 50...55? north latitude.