Acaricidal Activity of Petroleum Ether Extract of Leaves of Tetrastigma leucostaphylum (Dennst.) Alston against Rhipicephalus (Boophilus) annulatus

Table 2

Effect of nicotine against R. (B.) annulatus.

Sl. number	Acaricide	Mean tick weight per replicate ± SEM (g)	Mean % adult mortality within 15 days ± SEM	Mean eggs mass per replicate ± SEM (g)	Index of fecundity ± SEM	Inhibition of fecundity (%)	Hatching (Visual %)
1	Methanol (Control)	0.834 ± 0.009^a	0 ± 0	0.390 ± 0.002^b	0.462 ± 0.006^a	0	100
2	1250 ppm	0.867 ± 0.011^a	0 ± 0	0.332 ± 0.005^a	0.383 ± 0.004^b	16.96	100
3	2500 ppm	0.826 ± 0.021^a	0 ± 0	0.311 ± 0.015^a	0.377 ± 0.013^b	18.43	100
4	5000 ppm	0.839 ± 0.016^a	0 ± 0	0.310 ± 0.027^a	0.369 ± 0.029^b	20.01	100
5	10000 ppm	0.845 ± 0.016^a	0 ± 0	0.306 ± 0.018^a	0.364 ± 0.024^b	21.22	100
6	20000 ppm	0.834 ± 0.006^a	0 ± 0	0.299 ± 0.002^a	0.358 ± 0.003^b	22.41	100

= 4; values are mean ± SEM; means bearing different superscripts a or b () indicate significant difference when compared with the control and nicotine standard.