Table 1 Detailed table of the significant phylotypes found

Geographic origin (Figure 2A)

1

Palearctic

46

12, P = 0.004

2

1

12

Tot cov = 16%

Host genus (Figure 2B)

2

Pinus

100

32, P = 0.008

3

4

8

Tot cov = 90.4%

3

Pseudotsuga

100

5, P < 0.0001

2

0

∞

4

Larix

100

4, P < 0.0001

1

0

∞

5

Picea

82

15, P < 0.0001

2

1

14

6

Cupressaceae

80

4, P = 0.004

2

0

∞

7

Abies

88

7, P < 0.0001

1

1

7

Feeding site (Figure 2C)

8

Shoot & branch

67

4, P = 0.005

2

3

1.3

Tot cov = 5%

Host genus & geographic origin (Figure 3)

9

Nearctic & Pinus

100

20, P < 0.0001

3

11

11

Tot cov = 82.2%

10

Pseudotsuga/ Abies

100

5, P < 0.0001

2

0

∞

11

Larix

100

4, P < 0.0001

1

0

∞

12

Palearctic & Pinus

42

5, P = 0.054

1

0

∞

13

Palearctic & Picea

100

7, P < 0.0001

2

0

∞

14

Nearctic & Picea

70

7, P < 0.0001

1

0

∞

15

Palearctic & Pinus

50

6, P = 0.001

1

0

∞

16

Abies

88

7, P < 0.0001

1

1

7

17

Cupressaceae

80

4, P = 0.002

2

0

∞

Ecological niche (Figure 4)

18

Shoots and branches of Pseudotsuga spp. and/or Abies spp.

100

5, P < 0.0001

2

0

∞

Tot cov = 56.2%

19

Shoots of Pinus spp. subsect. Pinus

100

4, P < 0.0001

1

1

4

20

Shoots of Picea spp.

60

3, P = 0.002

1

0

∞

21

Branches of Picea spp.

70

7, P < 0.0001

1

5

1.4

22

Branches of Pinus contorta

100

3, P = 0.002

1

2

1.5

23

Shoots of Pinus edulis and/or monophylla

100

3, P = 0.003

1

0

∞

24

Branches of Pinus sylvestris and/or P. nigra

100

3, P = 0.003

1

1

3

25

Shoots of Pinus spp. subsection Pinaster

100

3, P < 0.0001

1

0

∞

26

Shoots of Juniperus spp.

100

4, P < 0.0001

2

0

∞

27

Branches of Abies spp.

86

6, P < 0.0001

2

1

2