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Powdery mildew caused by Erysiphe pisi DC is an important pea disease which causes high yield and quality losses. The most efficient way to control this disease is the use of resistant cultivars. Three genes of resistance are known so far in pea, namely er1, er2 and Er3. The most widely deployed gene in pea cultivars worldwide is er1. Resistance conferred by er1 is complete and considered to be durable,...
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