Table 1.
Median lethal concentration (LC50) estimates of weekly collections and cumulative totals for populations obtained from an organically and commercially managed potato field in Wisconsin, 2018
| Population | Week | N | Slope | LC50 (μg) | 95% CI a | χ 2 b | PR > χ 2 |
|---|---|---|---|---|---|---|---|
| Commercial | 1 (May 31) | 200 | 1.12 | 2.00 | (0.58–4.14) | 19.20 | <0.001 |
| Commercial | 2 (Jun 7) | 150 | 2.02 | 7.16 | (0.49–12.14) | 6.08 | 0.0137 |
| Commercial | 3 (Jun 14) | 150 | 1.50 | 6.44 | (3.60–11.05) | 31.59 | <0.0001 |
| Commercial | 4 (Jun 21) | 100 | 1.86 | 12.12 | (6.26–23.09) | 19.52 | <0.0001 |
| Commercial cumulative | NA | NA | 1.47 | 6.15 | (4.83–7.69) | 158.10 | <0.001 |
| Organic | 1 (May 31) | 350 | 1.10 | 1.64 | (1.06–2.55) | 79.80 | <0.001 |
| Organic | 2 (Jun 7) | 150 | 2.48 | 2.03 | (1.27–3.16) | 24.94 | <0.001 |
| Organic | 3 (Jun 14) | 70 | 2.28 | 2.82 | (0.17–6.22) | 5.63 | 0.017 |
| Organic | 4 (Jun 21) | 0 | NA | NA | NA | NA | NA |
| Organic cumulative | NA | NA | 1.83 | 2.32 | (1.81–2.87) | 92.00 | <0.001 |
a
95% confidence interval (CI) estimates around LC50 value estimates.
b
Chi‐square analysis effects of the Proc Probit regression.