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The methods used by the Plantenziektenkundige Dienst, Wageningen, in forecasting possible outbreaks of apple and pear scab (Venturia inaequalis and V. pirina) in the Netherlands [cf. 35, p. 302] are described. The work is done in collaboration with the Royal Dutch Meteorological Institute, the Horticultural Extension Service, and several private fruit growers. The warnings are of particular importance to growers using the recently developed curative organic mercurials, which are applied afterdoi:10.18174/njas.v5i4.17728 fatcat:d5fj4q6tszcmrorwkthjo7hsqq