Abstract :
[en] The European commission directive EC 128/2009 calls for monitoring pests and pathogens of major crops. The monitoring
data may be analysed for trends over time, including tests for a potential loss of biodiversity in the domain of plant pests
and pathogens. The monitoring programs carried out in Luxembourg since 2007 provided evidence for an increasing role
of yellow rust and a decreasing role of brown rust on winter wheat. Vast inter-annual variability was observed at the level
of Fusarium head blight and mildew symptoms on winter wheat as well as at the level of Ceutorhynchus counts in oilseed
rape, but no trend towards extinction could be demonstrated. Septoria leaf blotch was present in winter wheat at high levels
towards the end of all seasons. The maximum number of Brassicogethes aeneus individuals found per main stem and season
on oilseed rape increased slightly but significantly between 2007 and 2017. Substantial evidence for highly dynamic changes
in the pest populations was found, but no evidence for the vanishing of the monitored species could be demonstrated.
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