Publication - Advice and guidance

Potato exports guide

Information on the conditions and phytosanitary requirements for the export of Scottish potatoes, where known by country.

Potato exports guide
Supplementary information

Dutch Scab and Dutch Scurf scales

Dutch scab scales (updated 16 July 2019)

Scale 1

About 50% of the number of tubers is free from scab, whereas the remaining 50% may have 1 to 2 small shallow lesions covering max. 1/32 of the tuber's surface.

Scale 1½

About 33% of the number of tubers is free from scab, whereas the remaining 66% may have 2 to 4 small shallow lesions covering max. 1/16 of the tuber's surface.

Scale 2

Nearly all tubers are affected by scab. Each tuber may have 4 to 8 scab lesions covering max 1/12 of the tuber's surface.

Scale 2½

Nearly all tubers are affected by scab. Each tuber may have 5 to 10 scab lesions covering max 1/8 of the tuber's surface.

Dutch scurf scales

Rhizoctonia 10% light

10 tubers out of 100 tubers may have light infection (max 1/20 of the tuber's surface area covered) with Rhizoctonia solani.

Rhizoctonia 25% light

25 tubers out of 100 tubers may have light infection (max 1/20 of the tuber's surface area covered) with Rhizoctonia solani.