The status of dodine resistance of Venturia inaequalis populations in Poland.

The monitoring of Venturia inaequalis resistance to dodine was conducted in 2008 season in 232 commercial orchards situated in different regions of Poland, where apple scab symptoms were observed. The isolates have been classified into four categories (very high, high, medium and low level of resistance). The low level (L) of resistance was noted in 60 orchards (26% of all tested orchards), medium (M) and high (H) levels were observed in 54 orchards for each resistance level (23%) and very high resistance (VH) of V. inaequalis forms to dodine in 64 orchards (28%). According to questionnaire fulfilled by growers, in majority of orchards, during the last eight years dodine was not used or used only ones or twice in a season.