SUMMARY Controlled experiments on post‐emergence damping‐off, using mixtures of susceptible (Lepidium sativum ) and resistant ( Lolium rigidum ) seedlings inoculated with Pythium irregulare, demonstrated that rates of multiplication and advance of the disease were determined mainly by the net density of susceptible seedlings and were little affected by the resistant plants present.
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Burdon et al. (1976) studied this question.
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