اثرات عصاره‌های الکلی و هگزانی گیاه به لیمو (Lippia citriodora) بر دموگرافی سفید بالک پنبه Bemisia tabaci (Gennadius) در شرایط آزمایشگاه

Today, based on numerous studies, plant extracts and essential oils are considered to be healthy alternatives to pesticides. In the present study, Lippia citriodora extract was used to study the demographics of Bemisia tabaci (Gennadius) pest, which is one of the most important pests of agricultural products with global distribution. In order to extract the studied plant, two types of solvents were selected, including pure methanol and pure hexane (as polar and non-polar solvents, respectively). Different concentrations of methanolic and hexane extracts were prepared. The data were analyzed based on the age-sex life table of bisexuals. The results showed that treatment with methanolic lemon had the greatest effect on reducing the survival of whiteflies. The effect of the treatments on the intrinsic rate of population growth (day-1), the final rate of population growth (day-1), the duration of each generation (day) and the gross and net rate of reproduction (egg / individual) were significant at five percent. The inherent rate of population increase for control treatments and hexagonal and methanolic extracts was 0.063, 0.055 and 0.28 per day, respectively. In relation to the laying period and the total number of eggs per insect, the control treatment with the values of 2.23 and 11.9 was in the highest group, respectively, and the treatment with methanolic lemon with the values of 0.43 and 2.112 was in the lowest group. In this study, all treatments were able to reduce the spawning period and the total number of eggs per female compared to the control. Among the two solvents used in this study for extraction, the best solvent methanol was for extracting an extract effective on whiteflies cotton. The results of this study indicate the proper effectiveness of lemon extract in controlling Bemisia tabaci.