Table 4.
Total seasonal catch of sterile (S) and wild (W) codling moths with acetic acid plus pear ester (AA-PE) and codlemone plus pear ester (CM-DA) lures in delta traps operated within orchards under management by sterile insect treatment (SIT) alone or combined with pheromone mating-disruption (MD).
| Experiment Number | Orchard Treatment 1 | Lure 2 | Males 3 | Females 3 | S:W Ratio | Contingency Table Analysis of Male Versus Female S:W Ratios within a Row (Lure) | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Sterile | Wild | Sterile | Wild | Male | Female | χ2 statistic | p-Value | |||
| Exp. 2 | SIT | AA-PE | 579 | 6 | 720 | 8 | 99:1 | 90:1 | 0.0201 | 0.887 ns |
| CM-DA | 3467 | 12 | 313 | 15 | 270:1 | 21:1 | 64.9711 | 0.001 ** | ||
| χ2 = 3.847 df = 1, p = 0.05 | χ2 = 11.232 df = 1, p = 0.001 | |||||||||
| SIT + MD | AA-PE | 630 | 7 | 1123 | 13 | 90:1 | 86:1 | 0.0217 | 0.883 ns | |
| CM-DA | 3019 | 7 | 629 | 6 | 432:1 | 105:1 | 5.6711 | 0.017 ** | ||
| χ2 = 8.249 df = 1, p = 0.004 | χ2 = 0.226 df = 1, p = 0.881 | |||||||||
| Exp. 3 | SIT | AA-PE | 379 | 9 | 489 | 18 | 42:1 | 27:1 | 0.756 | 0.385 ns |
| CM-DA | 6291 | 33 | 293 | 10 | 191:1 | 29:1 | 30.451 | 0.001 ** | ||
| χ2 = 16.219 df = 1, p = 0.001 | χ2 = 0.0001 df = 1, p = 0.992 | |||||||||
| SIT + MD | AA-PE | 133 | 5 | 388 | 19 | 27:1 | 20:1 | 0.0768 | 0.782 ns | |
| CM-DA | 1734 | 245 | 355 | 56 | 7:1 | 6:1 | 0.3730 | 0.541 ns | ||
| χ2 = 8.676 df = 1, p = 0.003 | χ2 = 18.639 df = 1, p = 0.001 | |||||||||
1 SIT treatment was one weekly delivery of 4000 mixed-sex (1:1) sterile codling moths ha−1; MD treatment was 750 Isomate-CM/LR TT dispensers ha−1 in Exp. 2 and 1000 Isomate-CM-Flex dispensers ha−1 in Exp. 3.
2 AA-PE lure was a single 8 mL propylene bottle with a 3 mm diameter hole in its lid containing two small cotton balls and a 5 mL load of an acetic acid plus PE mixture (240:1 µL v:v); CM-DA lure is a grey rubber septum loaded with 3 mg of codlemone plus 3 mg of pear ester.
3 Results of χ2 analyses are shown beneath each 2 × 2 contingency table of sterile and wild moth catches for each sex to test null hypothesis that the two lures provide the same S:W ratios within each orchard management treatment and experiment.