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Advisory date Agriculture AGRlCO aphid activity applied assessment basic seed black leg Braunschweig breeders centres cereals certified seed chitted class of seed clonal selection clones crop inspection Dietrich Homann disease number dry rot Dutch seed potato early East Friesland Emmeloord farmer field inspection Flevoland Polder fungicide gene bank gibberelic acid grading growing areas Hannover harvest haulm destruction Hettema Zonen Holland infection insecticides insp inspectors James E Rennie July leaf roll Lelystad ln addition lnspection lnstitute Lower Saxony Maneb merchants Netherlands organisation PAGV pathotype Plant Protection plot potato breeding potato cyst nematode potato virus pre-basic seed RAGlS region Rennie Award Research roguing seed crops seed potato crops seed production seed stocks severe virus silver scurf single tuber soil storage sugar beet susceptibility t/ha technique temperature tuber testing virus diseases viruses Wageningen ware crops ware growers ware potatoes West Germany Wezep yield