Powdery mildew caused by Blumeria graminis f. sp. hordei is one of the most important diseases of barley in Poland. B. graminis is a genetically diverse pathogen with different special forms and races. The aim of the two-years’ experiment was to assess of B. gramins f. sp. hordei virulence frequency and powdery mildew occurrence on four winter barley cultivars. Virulence frequency of the pathogen depended on place and term of exposition. The occurrence of powdery mildew on four winter barley cultivars depended on virulence frequency of the pathogen and weather conditions.
Results of presented experiments indicated, that iron phosphate (III) protected plants of Hosta fortunei and Tagetes patula against damage caused by Iberian slug (Arion lusitanicus) and Whitelipped banded snail (Cepaea hortensis). This product showed very similar results to reference products based on metaldehyde and methiocarb.