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Growth chamber and orchard experiments were carried out to clarify the response of the cherry leaf spot pathogen, Blumeriella jaapii, and microorganisms in the leaf litter to two levels of urea (2.5% or 5%) applied post leaf fall to sour cherry leaves. In general, urea application reduced the development of B. jaapii measured as biomass by quantitative PTA-ELISA in the leaf litter and spore counting...
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