Plot Treatment* % Crown cover % Slope Mean dbh ± SE** Basal area (m2/ha) % P. albicaulis*** Trees per ha % P. albicaulis****
1 Untreated control 60 15 29.1 ± 3.0 76.1 79 840 94
2 Verbenone Plus 40 18 21.4 ± 2.7 17.7 100 395 100
3 Untreated control 60 25 23.5 ± 1.5 48.6 95 964 87
4 Untreated control 20 18 25.5 ± 1.6 53.1 63 914 70
5 Verbenone Plus 40 17 27.3 ± 2.4 74.7 41 988 88
6 Verbenone Plus 40 5 21.3 ± 2.1 45.5 49 939 63
7 Untreated control 40 30 24.3 ± 2.2 57.0 40 939 63
8 Verbenone Plus 20 32 21.4 ± 3.1 17.2 52 370 87
*Verbenone Plus [acetophenone, (E)-2-hexen-1-ol + (Z)-2-hexen-1-ol and (−)-verbenone] applied at 50 U/plot.
**dbh, diameter at breast height (1.37 m) in cm; SE, standard error.
***Based on basal area (cross-sectional area of trees at 1.37 m in height).
****Based on number of trees.
Table 2: Characteristics of experimental 0.4-ha plots at June Mountain Ski Area(37.75°N, 119.06°W; 3, 012-m elevation), Inyo National Forest, California, USA, 2010.