Effects of Datura stramonium L. (Solanaceae) leaf extract on predatory mite, Neoseiulus californicus (Mc Gregor, 1954) (Acari: Phytoseiidae)

Abstract

The toxic effects of Datura stramonium L. (Solanaceae)’s ethanol leaf extract were investigated on Neoseiulus californicus (McGregor, 1954) (Acari: Phytoseiidae) at doses of 1.875, 3.750, 7.500, 15.000, 30.000 and 60.000 ppm which were obtained from plants. The studies were carried out at 25±1°C, 60±5 % RH and 16 hours of photoperiod conditions. Different doses of D. stramonium’s leaf extracts didn’t have any negative effects on the eggs hatching ratio and duration. Moreover, D. stramonium’s leaf extracts have effects for the oviposition deterrent activities on the female egg laying capacity. At 15.000, 30.000 and 60.000 ppm doses of D. stramonium, females laid no eggs until 48 hours. After 96 hours at 60.000 ppm doses of D. stramonium extracts, all of the N. californicus females were died. D. stramonium’s different doses have a different acaricidal effects against to adult females of N. californicus. 7.500, 15.000, 30.000 and 60.000 ppm doses of D. stramonium were effective according to the control and the mortality rate of predatory mite adults were 40%, 48%, 68% and 96% after 120 hours after the application and for each concentration level respectively.