Written by Charlotte Cunningham
Farmers require a tailored plan to contain the spread of clubroot and produce important brassica crops sustainably, according to new AHDB research. CPM reports. The increasing prevalence of clubroot, its patchy occurrence and the rise of resistance-breaking strains has all been revealed in new research from AHDB. It has also updated guidance to help farmers map clubroot pressures and identify management options, which include targeted treatment at problematic patches. Clubroot, caused by the pathogen Plasmodiophora brassicae, has increased in the UK, due mainly to shorter rotations along with milder and wetter winters said the levy board. When growing crops in a clubroot-infected field, current advice is to choose a resistant variety which contains the ‘Mendel’ resistance mechanism. However, the effectiveness of this mechanism has reduced at some UK sites in recent years. The researchers aimed to establish how significant and widespread the erosion of this resistance is. Sample results Soil samples from 75 high-risk clubroot fields were used to grow a resistant and a susceptible winter oilseed rape variety, respectively. In about half of these ‘bioassays’, the resistant variety developed relatively strong symptoms. In fact, the levels were high enough at 15% of the sites to indicate that resistance was no…
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