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Genes of resistance to Oidium lycopersicum from Lycopersicon hirsutum LA 1775 were introduced to L. esculentum. Breeding procedures were based on a one-way programme up to the F2 generation and then four different methods were adopted to obtain F4 and BC4 populations. Screening tests among those hybrid populations were performed in a greenhouse and showed segregation for resistance to powdery mildew...
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