Table 1.
Honey bee phenothrin bioassay summary. The LD50 values are in shown in units of ng phenothrin/mg bee. The LD50 values were considered significantly different if the 95% CI of the LD50 values did not overlap between colonies or test dates. Letters and numbers beside LD50 values indicate significant differences in rows and columns, respectively.
| Month | Control | Amitraz | IPM | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n | LD50 (95% CI) | Slope (SE) | n | LD50 (95% CI) | Slope (SE) | n | LD50 (95% CI) | Slope (SE) | |
| May | 308 | 0.45 (0.35–0.52) a123 | 2.6 (0.4) | 239 | 0.48 (0.45–0.52) a1 | 6.4 (0.7) | 229 | 0.47 (0.32–0.57) a123 | 3.1 (0.6) |
| June | 489 | 0.45 (0.42–0.46) a13 | 7.2 (0.5) | 576 | 0.42 (0.40–0.44) a2 | 7.6 (0.5) | 531 | 0.32 (0.29–0.34) b3 | 5.8 (0.6) |
| July | 448 | 0.41 (0.38–0.43) a1 | 5.3 (0.5) | 374 | 0.43 (0.40–0.48) a12 | 3.7 (0.5) | 329 | 0.45 (0.41–0.49) a1 | 5.0 (0.6) |
| August | 383 | 0.33 (0.29–0.35) b2 | 4.7 (0.6) | 303 | 0.50 (0.46–0.54) a1 | 4.8 (0.6) | 543 | 0.35 (0.34–0.38) b2 | 4.7 (0.4) |
| September | 297 | 0.48 (0.45–0.51) a3 | 7.3 (0.7) | 252 | 0.42 (0.39–0.45) b12 | 6.3 (0.7) | 284 | 0.47 (0.44–0.50) ab1 | 6.7 (0.7) |
| October | 362 | 0.41 (0.37-0.44) a1 | 4.3 (0.6) | 464 | 0.34 (0.31–0.36) b3 | 4.8 (0.5) | 73 | 0.43 (0.31–0.52) ab123 | 4.7 (1.4) |