Table 4.

Summarized data of felled western white pine in experiment 3 as of 21 October 2015, where 7 of 10 trees per treatment were autopsied. The percent of bole height to percent circumference attacked by MPB and stained phloem was calculated. The controls had the greatest staining with a mean of 55.6% of tree height, which differed significantly from the TREE-äge/V/GLV trees with only 21.2% of bole height stained. The TREE-äge/PPZ-treated trees were intermediate, with 38.3% of bole height stained. Likewise, the controls had the greatest mean square meter of phloem blue-stained, followed by TREE-äge/PPZ and TREE-äge/V/GLV, but these were not significant. Of the dead (n = 10) trees, 49.9% of bole height was blue-stained, which was significantly different from the live (n = 11) trees with 27.9% of bole height stained. Furthermore, mean square meter area of live and dead trees (3.2 ± 1.9 SD and 6.4 ± 2.9 SD, respectively) was statistically significant. Grouping information used the Tukey method and at the 95% confidence level.

TreatmentNo. live/dead of trees autopsiedMean % height stained1Mean % circumference discoloredMean m2 sapwood discolored
Control0/755.56 a65.1 a6.17 a
TREE-äge/PPZ5/739.10 ab35.0 a4.91 a
TREE-äge/V/GLV5/721.18 b33.7 a3.04 a
  • 1 Means that do not share a letter are significantly different.