Screening Spinach Cultivars for White Rust Resistance and Bolting

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  • 1 Institute for Adriatic Crops, Put duilova 11, Split 21000, Croatia.
  • 2 Texas Agricultural Experiment Station, Vegetable & Fruit Improvement Center, Texas A&M University, 1619 Garner Field Rd., Uvalde, TX 78801.

Areas with mild climate conditions are suitable for growing winter spinach (Spinacia oleracea L.). Successful production depends on choosing slow-bolting cultivars resistant to major diseases in each area. Field experiments with a total of 18 cultivars were conducted during 8 years in the Winter Garden region of Texas, an area known for its high white rust (Albugo occidentalis G.W. Wils) inoculum. Spinach cultivars differed widely in their resistance to both white rust and bolting, and the incidence of both traits was more severe as the season progressed. White rust infection increased linearly with average monthly minimal air temperature. Cultivars Fidalgo, Springfield, and Springer were slow bolting and are suitable for areas with no white rust incidence, while cvs. ASR-318, DMC 66-09, Fall Green, Samish, and San Juan were more white rust resistant.

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