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acreage arable farms beetles boxes Breeder Brittany bulk CAVPAM certification chemical chits co-operatives coarse sand contract countries Desiree disease distribution Dutch Eizergemeinschaften farmers France French gangrene Germany and Holland grade of seed Harvesting and Disposal haulm Hettema Zonen increasing individual farmers interest in Thiabendazole irrigation James E Rennie kwik larger seed lnstitute Lower Saxony Maincrop maize manager Maneb powder Meidema merchants and wholesalers NANGlCA necrosis nitrogen Ostara outgrades packhouse planter Planting and Growing ploughed Polder polythene Pomme de Terre potato break potato production Potatoes grown processed potatoes programme proportion Rhizoctonia ridge rotation row Amac harvesters second earlies Seed crops seed growers seed production soil sprayed starch industry storage study tours sugar beet temperature tonnes per hectare tractor trailers tuber uncertified varieties Virus Wageningen ware crops ware growers ware production West Germany western world whilst winter wheat yield