Table 1. Infestation and damage rates within the survey units.
Description of the survey units (stand age, unit area, median willow girth, plant density and estimated total number of plants) and the rates of KSHB infestation and major plant damage (n = number of individuals examined). The total numbers of plants infested and damaged in each unit are extrapolated. In the forest units, data are for S. lasiolepis and S. gooddingii; in the scrub units, data are for B. salicifolia.
| Unit | Age | Area | Girth | Density | Infested | Damaged | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| # | yr | ha | cm | #/40 m2 | Total | n | Rate | Total | n | Rate | Total |
| A. Riparian forests | |||||||||||
| 1 | 35 | 14.64 | 130.8 | 2 | 7,319 | 39 | 74% | 5,442 | 50 | 12% | 878 |
| 2 | 5 | 1.78 | 25.9 | 36 | 16,026 | 143 | 94% | 15,130 | 67 | 51% | 8,133 |
| 3 | 15 | 3.02 | 52.7 | 7 | 5,517 | 79 | 100% | 5,517 | 50 | 98% | 5,407 |
| 4 | 35 | 5.13 | 73.7 | 1 | 1,282 | 32 | 91% | 1,162 | 38 | 82% | 1,046 |
| 5 | 35 | 18.08 | ND | 3 | 13,561 | 26 | 96% | 13,040 | 43 | 84% | 11,354 |
| 6 | 22 | 12.26 | 83.8 | 3 | 9,194 | 37 | 95% | 8,697 | 44 | 86% | 7,940 |
| 7 | 10 | 0.80 | 39.0 | 22 | 4,407 | 81 | 100% | 4,407 | 65 | 94% | 4,136 |
| 8 | 5 | 2.11 | 18.3 | 72 | 37,953 | 163 | 87% | 33,063 | 90 | 23% | 8,856 |
| 9 | 22 | 10.21 | ND | 4 | 10,211 | 40 | 100% | 10,211 | 51 | 100% | 10,211 |
| 10 | 22 | 23.04 | 66.0 | 3 | 17,280 | 42 | 98% | 16,868 | 68 | 78% | 13,468 |
| 11 | 35 | 4.68 | 81.3 | 8 | 9,365 | 31 | 100% | 9,365 | 86 | 78% | 7,296 |
| 12 | 22 | 3.14 | 73.7 | 12 | 9,421 | 42 | 100% | 9,421 | 54 | 89% | 8,375 |
| 13 | 22 | 15.01 | 54.6 | 10 | 37,526 | 70 | 97% | 36,454 | 52 | 58% | 21,650 |
| 14 | 22 | 17.84 | 34.3 | 19 | 84,717 | 141 | 75% | 63,688 | 127 | 17% | 14,008 |
| 15 | 35 | 18.52 | 71.1 | 4 | 16,204 | 50 | 8% | 1,296 | 93 | 12% | 1,917 |
| 16 | 35 | 20.75 | 79.5 | 5 | 25,936 | 35 | 6% | 1,441 | 66 | 14% | 3,537 |
| 17 | 35 | 21.42 | 83.8 | 3 | 16,069 | 43 | 0% | 0 | 106 | 12% | 1,971 |
| 18 | 35 | 7.06 | 67.3 | 4 | 7,062 | 44 | 2% | 161 | 64 | 28% | 1,986 |
| 19 | 35 | 6.82 | 79.8 | 5 | 8,524 | 33 | 61% | 5,166 | 67 | 16% | 1,399 |
| 20 | 35 | 12.86 | 82.6 | 3 | 9,643 | 40 | 10% | 964 | 58 | 5% | 499 |
| 21 | 35 | 9.56 | 77.0 | 3 | 7,172 | 35 | 6% | 410 | 73 | 7% | 491 |
| 22 | 10 | 12.83 | 43.9 | 15 | 48,124 | 60 | 95% | 45,718 | 82 | 13% | 6,456 |
| Total | 241.6 | 402,513 | 287,620 | 141,011 | |||||||
| B. Riparian scrub | |||||||||||
| 23 | 35 | 76.6 | ND | 1 | 19,150 | 40 | 33% | 6,319 | 30 | 0% | 0 |
| 24 | 35 | 38.0 | ND | 2 | 19,016 | 55 | 25% | 4,754 | 57 | 5% | 951 |
| 25 | 15 | 39.6 | ND | 1 | 9,909 | 34 | 24% | 2,378 | 42 | 0% | 0 |
| 26 | 25 | 31.7 | ND | 14 | 110,961 | 91 | 0% | 0 | 81 | 0% | 0 |
| 27 | 35 | 106.3 | ND | 6 | 159,467 | 55 | 2% | 3,189 | 50 | 2% | 3,189 |
| 28 | 35 | 68.7 | ND | 6 | 102,982 | 50 | 0% | 0 | 56 | 0% | 0 |
| 29 | 35 | 57.8 | ND | 3 | 43,378 | 50 | 0% | 0 | 52 | 0% | 0 |
| Total | 833.9 | 464,863 | 16,641 | 4,140 | |||||||
Notes.
- ND
- no data