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Summary Field experiments were carried out in 2010 and 2011 on three dwarf cultivars of China-aster: Duszek, Skrzat and Srebrzysta Gwiazdka. The following biological plant protection products were applied: Polyversum WP (Pythium oligandrum), Trifender WP (Trichoderma asperellum) and biotechnical product HF-Mycol (fennel oil – 23.08%) and Prev-B2 (D-limonene – 4.2%, boron – 2.1%). Fungicide Amistar 250 SC (azoxystrobin 250 g/l) was used as a standard, and unprotected plants were untreated control. Health conditions of leaves, stems and inflorescences were studied during the vegetation season. Collected data included number of wilting and dying plants. Mycological analyzes were also carried out on infested plant parts. Amistar 250 SC and Polyversum WP used preventively in protection of aster wilt showed the highest effectiveness. They also limited the decay of whole plants. Products Amistar 250 SC and Prev-B2 efficiently inhibited the development of dieback of entire inflorescences. Prophylactic spraying with Amistar 250 SC, Prev-B2 and Polyversum WP effectively limited the occurrence of lesions on the leaves and shoots in comparison with plants from control treatment.

Effectiveness of new plant protection products in the protection of Chinese aster against fungal diseases