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2017-2018 Tuber Tests

2017/18 Survey of Scottish Potato Tuber Production for the Presence of Dickeya spp.

This survey was designed to monitor seed and ware tuber production in Scotland for the presence of Dickeya spp., in support of Scottish legislation introduced in 2010, which established a “nil” tolerance for Dickeya infections in seed crops. This survey was risk-based and targeted stocks which held the greatest risk of carrying or contracting the disease. 

Included in the survey were samples from non-Scottish origin seed crops; the vast majority of which (75 samples from 75 stocks) were drawn from pre-basic crops produced from Northern Irish seed (3 stocks were Scottish but NI origin).  The remaining 12 samples were taken from Northern Irish S grade crops (5 samples from 5 stocks), from England and Wales, S grade crops (6 samples from 2 stocks) and 1 sample from a Republic of Ireland, S grade crop.  With regard to non-Scottish origin ware crops, 3 samples were drawn from 1 stock from England and Wales.  In addition, crops irrigated from Scottish watercourses, stocks grown near watercourses contaminated/previously contaminated with Dickeya spp. (with the exclusion of the Kirriemuir area, intense sampling from this area has been omitted for the last five years due to no positive findings in the watercourse since 2009).  A total of 212 samples were tested from 202 stocks.  

This survey was carried out in conjunction with the annual tuber surveys for Clavibacter michiganensis ssp. sepedonicus (potato ring rot) and Ralstonia solanacearum (brown rot) to comply with EU Commission Directives 2006/56/EC and 2006/63/EC, which requires member states to survey their potato production for the presence of these bacterial quarantine pathogens.

 

Table 1. Breakdown of samples included in the 2017/18 tuber survey for Dickeya spp..

 

Region

Crop Type

 

Total

 

Seed

Ware

 

Non-Scottish

Other Target*

Non-Scottish

Other Target*

 

 

Northern

Grampian

Central

Southern

 

 

47

24

8

8

 

11

19

45

1

 

-

-

-

3

 

-

4

14

28

 

58

47

67

40

Sub-Total

87

76

3

46

(212)

Total

163

49

212

 

*Other target material includes; irrigated crops and stocks grown near watercourses contaminated/previously contaminated with Dickeya spp.

Results

A total of 212 samples were tested.  Dickeya spp was not detected in any of the samples.