commiss direct eec march determin commun grade basic seed potato condit design applic grade commiss european commun regard treati establish european econom commun regard council direct eec june market seed potato amend commiss direct eec articl thereof order implement area intern frontier free movement good ensur accord provis treati provis direct eec respect market seed potato part territori member state satisfi stringent measur provid annex ii direct determin commun grade basic seed potato condit design applic grade measur provid direct accord opinion stand committe seed propag materi agricultur horticultur forestri adopt decis articl commun grade basic seed potato determin seed potato elig grade qualifi offici certif basic seed potato accord provis articl direct eec satisfi condit paragraph found offici examin satisfi condit condit refer paragraph plant health condit laid council direct eec council direct eec council direct eec council direct eec seed potato deriv materi satisfi condit laid annex satisfi addit stringent condit laid annex ii articl design commun grade basic seed potato eec grade case condit laid annex point thereof annex ii met eec grade case condit laid annex point thereof annex ii met eec grade case condit laid annex point thereof annex ii met design offici label provid annex iii direct eec head grade member state inform commiss extent appli respect commun grade certifi product articl member state bring forc law regul administr provis compli direct date provid implement council direct eec forthwith inform commiss thereof member state adopt provis refer direct accompani refer occas offici public procedur refer adopt member state member state commun commiss text main provis domest law adopt field cover direct articl direct address member state brussel march commiss rené steichen member commiss oj oj oj oj oj oj oj annex condit satisfi materi commun grade basic seed potato deriv method micropropag includ meristem techniqu mother tuber free harm organ erwinia carotovora var atroseptica erwinia chrysanthemi potato leaf roll viru potato viru potato viru potato viru potato viru potato viru complianc requir establish offici test test offici supervis method materi multipli vitro deriv mother tuber compli condit laid point requir compulsori offici test test offici supervis appli method clonal select initi plant tuber directli deriv free harm organ list complianc requir respect establish offici test test offici supervis method grown crop satisfi requir crop rais product ground year elaps potato grown isol crop lower statu adequ isol distanc satisfact requir check offici field inspect respect blackleg free blackleg case eec grade plant affect blackleg case eec grade eec grade complianc requir check offici field inspect plant show symptom infect virus complianc requir check offici field inspect supplement case doubt laboratori test leav method offici field inspect provid subject offici field inspect subject low limit maximum number multipl account product condit annex ii addit stringent condit satisfi crop lot commun grade basic seed potato eec grade crop rais product ground year elaps potato grown free plant affect blackleg complianc requir check offici field inspect plant show symptom infect virus complianc requir check offici field inspect supplement case doubt laboratori test leav method offici field inspect provid subject offici field inspect subject low limit maximum number gener account product condit lot weight earth extran matter complianc requir check offici examin weight tuber infect dry wet rot complianc requir check offici examin eec grade condit laid point except appli standard respect blackleg plant affect eec grade condit laid point except appli standard respect blackleg plant affect standard respect infect virus plant show symptom thereof