SCOTTISH SEED POTATO CLASSIFICATION SCHEME - SASA

APPENDIX 3PRE-BASIC 1 to 4Column 1 Column 2 Column 3 Column 4 Column 5Diseases, pests, damage, and defects Individual Grouptolerances tolerancesCollectivegrouptolerancesAllowable %surfacearea coverGROUP IWart Disease NIL - -Potato Tuber Eelworm NIL - -Potato Cyst Nematode NIL - -Ring Rot NIL - -Brown Rot NIL - -Potato Tuber Moth NIL - -Potato Spindle Tuber Viroid NIL - -Colorado Beetle NIL - -GROUP IIDickeya spp NIL - -Blight 0.2%BlacklegNILGangrene/Dry Rot/Wet Rot 0.2%0.2%Frost damaged tubers 0.2%GROUP IIISkin spot 0.2%Black scurf 1.0% 12.5%5.0% 5.0%Common scab 5.0%33.0%Powdery scab 1.0% 12.5%GROUP IVExternal blemishes or tubers other than 1.0%diseased tubers whose shape isatypical for the varietySuperficial necrosis caused by strains NILof potato virus YGROUP VDirt or other extraneous matter 1.0%