بررسی اثر کشندگی عصاره‌ی متانولی چهار گونه ماکروجلبک دریایی قهوه‌ای و قرمز روی شته‌ی سبز هلو (Myzus persicae (Sulzer))

Marine macroalgae, which are usually called seaweeds, are obvious features of marine ecosystems. These macroscopic photosynthesizers are much more diverse than land plants both taxonomically and metabolically. Marine macroalgae are rich sources of metabolites. This research investigated the mortality effect of methanolic extracts by the Soxhlet method of Phaeophyta (Padina australis and Cystoseira trinodis) and Rhodophyta (Hypnea flagelliformis and Gracilaria corticata) on M. persicae grown on Capsicum annuum L. in the greenhouse of Mohaghegh Ardabili University has paid. Bioassay tests with leaf immersion method (in control concentrations (distilled water), 10 μl/mil and 50 μl/mil of each extract) and 20 M. persicae nymphs in each Petri dish. The dish was done with three repetitions. The results showed that both concentrations in all the extracts with the control had a statistically significant difference at the 5% probability level. The most lethal effect of macroalgae extracts after 72 hours at a concentration of 50 μl/mil was respectively, H. flagelliformis, P. australis, C. trinodis and G. corticata with an average of 28.88%, 25%, 17.66% and 13.33%. Therefore, it is suggested that considering that the extracts had little insecticidal potential, if used, they should be used in combination with other methods. Marine macroalgae extracts are a natural source of organic and mineral substances, which contain more than 60 minerals and 21 amino acids, several plant growth regulators such as mannitol and organic acid. Therefore, it is suggested to use adult M. persicae and higher concentrations of extracts or mixing with other plant extracts and essences in future research.