Table 6 Summary of repeated-measures ANOVA using PROC MIXED showing the effects of various Btk spray scenarios, host trees (balsam fir, white spruce and black spruce), and number of years after the first treatment on annual volume increment (AVI), specific volume increment (SVI), and current-year foliage defoliation

F

df

p

F

df

p

F

df

p

Protection scenario

4.67

4,14

0.0131

1.27

4,14

0.3263

47.32

4,14

 < 0.0001

Host species

38.86

2,395

 < 0.0001

56.66

2,395

 < 0.0001

115.21

2,104

 < 0.0001

Scenario × host species

11.27

8,395

 < 0.0001

8.74

8,395

 < 0.0001

1.56

8,124

0.144

Years after 1st treatment

76.25

9,394

 < 0.0001

118.03

9,395

 < 0.0001

47.14

10,368

 < 0.0001

Scenario × years after 1st treatment

3.7

36,394

 < 0.0001

2.69

36,394

 < 0.0001

7.8

39,388

 < 0.0001

Host species × years after 1st treatment

0.94

18,394

0.525

0.89

18,394

0.5879

1.56

20,333

0.0609

Scenario × host species × years after 1st treatment

0.77

72,394

0.9173

0.43

72,394

1

0.78

78,353

0.9129