Table 3.
Honey bee clothianidin bioassay summary. The LC50 values are in shown in units of ng clothianidin/mL/mg bee. The LC50 values were considered significantly different if the 95% CI of the LC50 values did not overlap between colonies or test dates. Letters and numbers beside LC50 values indicate significant differences in rows and columns, respectively.
| Month | Control | Amitraz | IPM | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n | LC50 (95% CI) | Slope (SE) | n | LC50 (95% CI) | Slope (SE) | n | LC50 (95% CI) | Slope (SE) | |
| May | 308 | 1.12 (0.78–1.43) b3 | 2.4 (0.3) | 269 | 0.48 (0.09–0.93) b4 | 1.5 (0.3) | 293 | 2.78 (2.37–3.16) a1 | 4.0 (0.5) |
| June | 280 | 0.81 (0.51–1.10) a3 | 1.9 (0.3) | 460 | 0.35 (0.09–0.64) ab4 | 1.2 (0.2) | 479 | 0.07 (0.001–0.25) b5 | 1.0 (0.2) |
| July | 357 | 1.20 (1.07–1.37) a3 | 3.3 (0.3) | 253 | 1.14 (1.04–1.28) a3 | 5.6 (0.7) | 276 | 1.39 (1.22–1.65) a34 | 3.7 (0.4) |
| August | 325 | 2.19 (1.95–2.49) ab2 | 3.7 (0.4) | 287 | 2.47 (2.24–2.71) a1 | 5.8 (1.0) | 416 | 1.97 (1.81–2.15) b23 | 4.5 (0.4) |
| September | 370 | 3.25 (2.94–3.55) a1 | 4.3 (0.4) | 356 | 2.29 (1.95–2.62) b1 | 2.8 (0.3) | 340 | 2.59 (2.23–2.97) ab1 | 2.6 (0.3) |
| October | 296 | 2.62 (2.33–2.93) a2 | 4.0 (0.4) | 447 | 1.75 (1.60–1.90) b2 | 5.3 (0.4) | 54 | 1.60 (0.89–2.04) b234 | 7.3 (2.2) |