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Summary The synergistic effect of anethole, the main component of star anise oil, on the activity of abamectin (Vertimec 018 EC) against the lesser mealworm (Alphitobius diaperinus Panzer) was investigated. In the studies 1% acetone solutions of anethole and aqueous solutions of insecticide with increasing concentrations (0.0125; 0.025; 0.05; 0.1; 0.15; 0.2; 0.4%) were used. The experiments were conducted on 10-day and 20-day old larvae and young (7–10 day old) adults using an oral administration of compounds in four different treatments (insecticide alone, anethole alone, insecticide given simultaneously with anethole, insecticide application was preceded by a 3-day culture on diet treated with anethole). The experiments were carried out in the rearing chamber at 29°C in the dark. The results show that anethole have a synergistic effect on the activity of abamectin only against the youngest larvae. After the simultaneous application of anethole and insecticide more than 4-fold decrease in the values of LC50 and LC90 was observed. In relation to older larvae and adults synergistic activity of anethole was very weak. Synergism ratios were 1.05–1.26.

Synergistic effect of anethole on the activity of abamectin against the lesser mealworm (Alphitobius diaperinus Panzer)