Toxicity, joint action effect, and enzymatic assays of abamectin, chlorfenapyr, and pyridaben against the two-spotted spider mite Tetranychus urticae

The Journal of Basic and Applied Zoology

Table 1 Acaricidal activity of technical (abamectin, chlorfenapyr, and pyridaben) and formulated (Agromectin, Challenger, and Sanmite) acaricides against eggs of two-spotted spider mite T. urticae by leaf-disk-dip technique

Acaricide	LC₂₅^a (mg/L)	95% confidence limits		LC₅₀^a (mg/L)	95% confidence limits		Slope^b ± SE	Intercept^c ± SE	(χ²)^d
Acaricide	LC₂₅^a (mg/L)	Lower	Upper	LC₅₀^a (mg/L)	Lower	Upper	Slope^b ± SE	Intercept^c ± SE	(χ²)^d
Abamectin	22.79	5.49	51.03	294.27	173.01	452.42	0.61 ± 0.09	− 1.50 ± 0.26	5.22
Chlorfenapyr	26.40	2.62	73.89	1032.93	562.75	2510.32	0.42 ± 0.09	− 1.28 ± 0.25	0.70
Pyridaben	838.21	192.29	1754.90	9550.54	4481.54	40,267.52	0.64 ± 0.06	− 2.54 ± 0.64	28.01
Agromectin	11.48	0.64	36.19	783.06	158.35	6852.69	0.37 ± 0.03	− 1.73 ± 0.08	31.34
Challenger	4.98	0.26	15.60	666.55	154.75	5374.64	0.32 ± 0.03	− 0.89 ± 0.08	8.82
Sanmite	5.02	1.57	11.99	731.36	389.22	1765.73	0.31 ± 0.03	− 0.89 ± 0.80	8.93

^aLethal concentration, 25% or 50%. The concentration value for a pesticide that is required to kill 25% or 50% of the members of tested eggs after a specified test duration
^bSlope of the concentration-mortality regression line ± standard error
^cThe y-intercept of the regression line ± SE
^dChi-square goodness of fit test