Table 2. Toxicity of Origanum vulgare and Syzygium aromaticum essential oils against protonymphs and adult females of the bean and tomato populations of Tetranychus urticae after 24 h.
| Essential oils | Stage | n a | Slope ± SE b | LC50(95% FLc) [µl L−1 air] | LC90(95% FLc) [µl L−1 air] | χ2(dfd) |
|---|---|---|---|---|---|---|
| Bean population | ||||||
| O. vulgare | protonymphs | 450 | 3.21 ± 0.31 | 1.67 (1.47–1.88)1 | 4.19 (3.57–5.21)7 | 3.23 (10) |
| adult females | 443 | 3.39 ± 0.30 | 2.05 (1.82–2.29)1 | 4.89 (4.18–6.01)7 | 4.83 (10) | |
| S. aromaticum | protonymphs | 530 | 7.13 ± 0.80 | 16.57 (15.16–17.76)2 | 25.06 (23.30–27.60)8 | 8.83 (13) |
| adult females | 524 | 6.13 ± 0.51 | 17.45 (15.45–19.29)2 | 28.24 (25.24–33.00)8 | 25.28 (13) | |
| Tomato population | ||||||
| O. vulgare | protonymphs | 539 | 2.69 ± 0.24 | 1.87 (1.62–2.13)3 | 5.61 (4.72–7.04)9 | 5.58 (13) |
| adult females | 537 | 2.55 ± 0.20 | 3.07 (2.57–3.64)4 | 9.76 (7.66–13.75)10 | 19.02 (13) | |
| S. aromaticum | protonymphs | 530 | 4.67 ± 0.40 | 22.37 (20.76–23.99)5 | 42.05 (37.91–48.22)11 | 6.43 (13) |
| adult females | 678 | 3.51 ± 0.27 | 29.60 (27.21–32.19)6 | 68.53 (59.85–81.65)12 | 7.47 (18) |
Notes.
a
number of mites.
b
standard error.
c
fiducial limits.
d
degrees of freedom.
The LC50 and LC90 values were compared for significance based on fiducial limits, labeled with numbers indicated as superscripts. The values indicated by the same number in each column (LC50 and LC90) were statistically the same according to the fiducial limits.