Table 1 In vitro activity of test compounds. Comparison of activity of compounds a-15 and a-17 with tolfenpyrad and tebufenpyrad on the motility of exsheathed third-stage (xL3) and fourth-stage (L4) larvae of Haemonchus contortus (after 24 h, 48 h and 72 h of exposure) and on the development of L4 (after 7 days of exposure)

a-15

–

–

55.63 ± 0.18

–

–

26.31^a

3.97 ± 0.35

a-17

–

–

51.60 ± 1.41

–

–

15.58^a

3.42 ± 0.50

Tolfenpyrad

2.98 ± 0.50

3.85 ± 1.33

3.05 ± 0.47

0.12 ± 0.07

0.06 ± 0.02

0.03 ± 0.02

0.08 ± 0.01

Tebufenpyrad

na

na

na

> 100

> 100

> 100

6.70^a