Written by cpm
Download PDF Seed potato producers are leaving no stone unturned to slow the proliferation of virus in British stocks, with straw mulches and mineral oils set to compliment systemic insecticides as part of a robust integrated pest management (IPM) strategy this year. CPM finds out more. We should no longer be applying pyrethroids at all. By Rob Jones and Lucy de la Pasture Virus levels in Britain’s seed potato stocks have been increasing in recent seasons, most acutely in English-grown seed but Scotland has also seen infection creeping north. It’s a situation that’s prompting some concern for potato growers. Seed certification schemes in Scotland and England are designed to reassure ware growers that the seed they buy meets the quality specifications of each grade, including virus levels. Visual inspection of the growing crop has long been used to identify infection before haulm destruction and has historically been a reasonable indicator of infection levels in daughter tubers. Potato Virus YN (PVYN), a non-persistent potyvirus, has taken over as the dominant strain from PVYO. The change in dominance has put pressure on the seed inspection system because, unlike the previously dominant strain PVYO, PVYN doesn’t as readily express classic mosaic symptoms in…
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