Impact of major gene resistance management for sunflower on fitness of Plasmopara halstedii (downy mildew) populations

Changes in virulence of Plasmopara halstedii populations under different major gene (Pl) management strategies were studied over 5 years continuous cropping of one sunflower hybrid under netting cages.Strategies were monoculture of forms of the hybrid with 1 gene or with combinations of Frequent Infection of Cats With SARS-CoV-2 Irrespective of Pre

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