Table 3.
Linear regression results for the relationship between mean density and mean crowding per tree and per 1,000 cm2 of trap area for spotted lanternfly nymph instars, for A. altissima in windbreak areas at Blue Marsh Lake in 2020
| Instar | Slope (± SE) | Intercept (± SE) | R2 value | F-value | Pr > F |
|---|---|---|---|---|---|
| Per tree (trap) | |||||
| First | 2.11 ± 0.14 | 5.65 ± 5.20 | 0.813 | 218.6 | <0.0001 |
| (2.18 ± 0.13) | 0.852 | 294.2 | <0.0001 | ||
| Second | 2.46 ± 0.21 | 6.27 ± 3.85 | 0.673 | 132.6 | <0.0001 |
| (2.67 ± 0.17) | 0.790 | 245.2 | <0.0001 | ||
| Third | 2.42 ± 0.21 | 1.18 ± 1.13 | 0.723 | 136.4 | <0.0001 |
| (2.57 ± 0.15) | 0.857 | 312.1 | <0.0001 | ||
| Fourth | 1.39 ± 0.17 | 7.58 ± 2.83 | 0.604 | 65.0 | <0.0001 |
| (1.68 ± 0.15) | 0.753 | 131.8 | <0.0001 | ||
| Combined | 1.98 ± 0.15 | 13.48 ± 6.55 | 0.701 | 171.8 | <0.0001 |
| (2.20 ± 0.11) | 0.841 | 392.0 | <0.0001 | ||
| Per 1,000 cm2 of trap area | |||||
| First | 2.29 ± 0.16 | 9.32 ± 10.70 | 0.797 | 197.9 | <0.0001 |
| (2.35 ± 0.14) | 0.839 | 265.9 | <0.0001 | ||
| Second | 2.42 ± 0.23 | 13.48 ± 7.30 | 0.632 | 110.7 | <0.0001 |
| (2.68 ± 0.18) | 0.764 | 211.7 | <0.0001 | ||
| Third | 2.39 ± 0.23 | 4.57 ± 2.65 | 0.664 | 109.8 | <0.0001 |
| (2.65 ± 0.17) | 0.804 | 231.1 | <0.0001 | ||
| Fourth | 1.43 ± 0.20 | 16.20 ± 5.95 | 0.55 | 53.1 | <0.0001 |
| (1.75 ± 0.17) | 0.718 | 110.7 | <0.0001 | ||
| Combined | 2.08 ± 0.17 | 27.11 ± 13.53 | 0.658 | 141.32 | <0.0001 |
| (2.33 ± 0.13) | 0.818 | 334.7 | <0.0001 |
Values in parentheses are for regressions without a fitted y-intercept, where the regression line is forced through the origin (0, 0).