Table 2.
Survival and damage scores of seedling grasses exposed to L. bonariensis adults in the laboratory.
| Plant seedling survival | ||||||
|---|---|---|---|---|---|---|
| Plant species | Date exposed | Date assessed | No plants | Mean plant damage score (1–5) | Mean proportion of plants surviving (SE) | |
| Hybrid ryegrass | 23 Dec 11 | 10 Jan 12 | 30 | 2.27 (0.31) | 0.97 (0.03) | |
| P. colensoi | 23 Dec 11 | 10 Jan 12 | 30 | 4.3 (0.20) | 0.43 (0.09) | |
| Hybrid ryegrass | 13 Dec 12 | 2 Jan 13 | 30 | 4.3 (0.24) | 0.47 (0.09) | |
| F. novae-zelandiae | 13 Dec 12 | 2 Jan 13 | 30 | 4.3 (0.09) | 0.43 (0.09) | |
| C. rigida | 13 Feb 12 | 2 Mar 12 | 15 | 2.53 (0.44) | 0.8 (0.1) | |
| Weevil Oviposition | ||||||
| Plant species | Date exposed | Date assessed | No plants | Mean no. eggs plus larvae per female (SE) | Mean no. tillers per plant (SE) | Mean diam of tillers (SE) |
| Hybrid ryegrass | 23 Dec 11 | 11 Jan 12 | 28 | 9.89 (2.19) | 3.1 (0.26) | 1.36 (0.08) |
| P. colensoi | 23 Dec 11 | 11 Jan 12 | 33 | 0.53 (0.19) | 1.27 (0.09) | 0.76 (0.05) |
| Hybrid ryegrass | 13 Dec 12 | 2 Jan 13 | 30 | 2.47 (0.87) | 2.37 (0.22) | 1.6 (0.09) |
| F. novae-zelandiae | 13 Dec 12 | 2 Jan 13 | 30 | 0 | 1.67 (0.15) | 0.8 (0.04) |
| C. rigida | 17 Feb 12 | 2 Mar 12 | 15 | 0.13 (0.13) | 1.6 (0.25) | 1.39 (0.11) |
Weevil oviposition on seedling grasses is also shown in relation to mean tiller numbers and diameter. The means for seedling damage and survival are those predicted by the regression model; standard errors are shown in brackets.