Insecticidal activity of Tagetes erecta L. methanol extracts on bean weevil, Acanthoscelides obtectus Say Coleoptera: Bruchidae
پذیرفته شده برای پوستر
عنوان دوره: سومین کنگره بین المللی حشره شناسی ایران
نویسندگان
1Plant Protection Department, Faculty of Agriculture, Gaziosmanpasa University, Tokat, Turkey,
2Plant Protection Department, Faculty of Agriculture, Gaziosmanpasa University, Tokat, Turkey
چکیده
The indiscriminate use of pesticides in agriculture can cause high levels of toxic residues in food, biological imbalance, environmental pollution, intoxication of humans/animals, and other direct and indirect effects. The use of plant extracts as alternative insecticides is a way to minimize the problems caused by synthetic insecticides. Tagetes erecta L. have larvicidal, antimicrobial, nematicidal and insecticidal activities. Therefore, in the present study, the insecticidal efficacy of crude methanol extracts of Tagetes erecta flowers and leaves against bean weevil, Acanthoscelides obtectus was studied at concentrations of 0.5, 5, 10, 25 and 50% by using seed and insect dipping methods. The adult mortality was assessed at 24, 72, 120 and 168 h after treatment. The results revealed that the crude methanol extracts of T. erecta leaves showed the highest insecticidal activity compared to that of the flower extract in both testing methods. The mortalities were 100 and 88.3% in leaf and flower extracts at 50% concentration with seed dipping method at 72 h after treatment, respectively. The mortality rate increased with increasing concentrations of the extracts and 100% mortality was observed in leaf extract at 50% concentration after 72 h with seed dipping method. The seed dipping method was more effective compared with the insect dipping method. The mortality rates were 100 and 76.7% with seed and insect dipping methods, respectively, at 72 h after treatment in leaf extract. Further studies are needed to identify the active ingredients of the extract responsible for insecticidal activity
کلیدواژه ها