Toxicity of Anethole and the Essential Oils of Lemongrass and Sweet Marigold to the Parasitic Mite Varroa destructor and Their Selectivity for Honey Bee (Apis mellifera) Workers and Larvae

Table 2

Lethal concentration (LC₅₀) and 95% confidence limits (CL) estimated for Varroa destructor female mites at 4 h after exposure to 0.5 ml/vial of six concentrations of essential oil products and tau-fluvalinate.

Compounds		LC50 (μg/ml)	95% CL	Slope ± SE	Intercept		df
Anethole	280	304.94	225.24–357.87	3.35 ± 0.86		26.70	46
Cymbopogon oil	280	474.13	349.86–592.17	2.98 ± 0.39		59.65	46
Tagetes oil	280	1256.27	1018.54–1578.25	1.92 ± 0.27		32.89	46
tau-fluvalinate	280	80.43	55.76–106.42	1.71 ± 0.24	1.75	28.23	46