Abstract
The proportion of the Scottish potato area planted to cultivars such as Maris Piper and Desiree, which can produce large numbers of berries, increased markedly during the 1970s. Such cultivars may add large quantities of true potato seed (TPS) to the soil and create serious weed problems. TPS can survive in the soil through a 7-year potato rotation, whilst tubers from seedlings add to the traditional groundkeeper problem. The implications of TPS as weeds of seed potato rotations are discussed in relation to data presented on seed production and survival and on tuber production by seedlings in the field under Scottish conditions. Seedlings may also present problems as ‘rogues’ in fields where TPS selected lines are grown.
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