Table 4 Data quality assessment by the data providers concerning a potential bias in insect pests and pathogens, and steps taken thereafter (contacting of new experts and completing the database).

From: Biotic threats for 23 major non-native tree species in Europe

Country

Initial data quality assessment

After initial assessment

Final assessment

Bias in insects and other pests

Bias in pathogens

Potential for more data from new experts

Contacting of new experts

Response of new experts

New entries/updates/gap filling

Overall bias

AT

2

2

No

n.a.

n.a.

Yes

1

BA

1

1

No

n.a.

n.a.

No

1

BE-WAL

2

2

Yes

Yes

No

Yes

2

BG

1

1

No

n.a.

n.a.

Yes

1

CH

1

1

No

n.a.

n.a.

Yes

1

CZ

1

1

Yes

No

n.a.

Yes

1

DE

NA

NA

Yes

Yes

Yes

Yes

2

DK

3

3

Yes

Yes

Yes

Yes

1

EE

2

2

Yes

Yes

Yes

Yes

1

ES

1

1

No

n.a.

n.a.

Yes

1

FI

NA

NA

No

n.a.

n.a.

Yes

1

FR

2

2

Yes

Yes

Yes

Yes

2

GB

2

2

Yes

Yes

No

No

1

GR

1

1

No

n.a.

n.a.

Yes

1

HU

1

1

No

n.a.

n.a.

No

1

IE

1

1

Yes

No

n.a.

Yes

1

IT

NA

NA

No

n.a.

n.a.

Yes

1

LT

2

2

No

n.a.

n.a.

Yes

2

NO

1

1

No

n.a.

n.a.

Yes

1

PL

NA

NA

No

n.a.

n.a.

Yes

1

PT

2

2

Yes

Yes

No

Yes

2

RO

2

3

Yes

Yes

Yes

Yes

1

RS

1

1

No

n.a.

n.a.

Yes

1

SE

3

3

Yes

Yes

Yes

Yes

1

SI

1

1

No

n.a.

n.a.

Yes

1

SK

NA

NA

Yes

No

n.a.

No

2

UA

2

2

Yes

Yes

Yes

Yes

2

  1. Every data provider agreed to check for new records and fill NAs in existing entries. The bias is evaluated according to the following scheme: 1 – ‘The data well reflect the situation of the pest/pathogen impact. There is no bias due to prioritization of certain tree species and/or lack of experts’; 2 – ‘The data on pest/pathogen impact have some bias. The bias due to prioritization of certain tree species and/or lack of experts is, however, minor’; 3 – ‘The data on pest/pathogen impact have major bias. Due to prioritization of certain tree species and/or lack of experts the data does not reflect the complete situation in the country and thus should not be used in a cross-country analysis’;
  2. n.a. – not applicable.
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