Use of autumn fungicide sprays to control stem canker (Leptosphaeria maculans) in winter oilseed rape

摘要

Stem canker is the most important disease of winter oilseed rape in southern Britain. A range of fungicide timings and cultivars was used to investigate control of natural stem canker epidemics at ADAS Boxworth, Cambridge during harvest years 1997-2002. Whilst good control of stem canker was achieved in most experiments by fungicide ap-plicaton, significant yield responses were obtained in only three out of nine experiments. The use of fungicides only in the autumn was most effective when final stemcanker at harvest was severe.