A field experiment performed in 2008 and 2009 autumn seasons in Southern Poland (Lower Silesia) using hybrid winter oilseed rape cultivar PR46W10 (Pioneer Hi-Bred) proved the significant effect of fungicide spraying time on the incidence and severity of symptoms caused by fungal pathogens Leptosphaeria maculans and L. biglobosa. The disease incidence and severity were the lowest (6.7%) when the fungicide (Capitan 250 EW, flusilazole 250 g/l) was applied in the time following mass ascospore release. The population of the pathogens greatly differed between years: in the autumn of 2008 L. maculans dominated (92%) over L. biglobosa, whereas in 2009 it was the opposite, and L. maculans was re-isolated from 7% symptoms only. Summer and early autumn of 2008 was cooler and wetter as compared to the same period in 2009. The results show that the introduction of decision support systems may cause more efficient protection of oilseed rape against stem canker of brassicas, one of the most important diseases of oilseed rape worldwide.
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