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Download PDF Water companies are working with farmers to reduce the amount of oilseed rape herbicides that find their way into drinking water supplies. CPM reports on a new study involving clethodim. Farmers are the guardians of the catchment. As long as they’re fully aware of the risks, they’ll take good care of it. By Tom Allen-Stevens New research suggests field rates of residual oilseed rape herbicides may be cut without loss of overall efficacy on blackgrass when used in sequence with clethodim (as in Centurion Max). The study, led by independent specialist Dr Stephen Moss, has shown good results from the sequences, even in resistant blackgrass situations. Targeted rate reductions could significantly reduce the amount of OSR herbicides found in ground and surface water, says Danny Coffey, catchment officer for Affinity Water, that commissioned the research. “Carbetamide and propyzamide cause us serious problems as we have a stringent drinking water quality standard for pesticides we must meet.” The study focused on two water supply catchments in South Herts, an area where Affinity Water relies heavily on groundwater supplies and where detections of carbetamide and propyzamide above the permitted level of 0.1 parts per billion are frequently exceeded. “It’s an…
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