Vol. 7, Issue 6, Part A (2020)

Author(s): Atallah F Mekhlif and Izdihar M Kafi

Abstract: Four native medical plants with potency metabolite extracts viz. spotted arum Arum dioscoridis, hemlock Conium maculatum, castor Rcinus communis and corn poppy Papaver rhoeas were investigated their efficacy on developed 3^rd instar larvae Culex pipiens molestus and functional fitness. The larval and pupal hemolymph appeared greenish only by P. rhoeas with 78.8% at LC₂₅. Also, applied larvae with LC₂₅ of R. communis and P. rhoeas extracts lost their siphon hair hydrophobicity with 64.0 and 34.0%. After larval treatment with LC₂₅ of the extracts, fetal results were observed on the following metamorphic stages; emergence failure ranged between 22.8% for A. dioscoridis to 8.0% and P. rhoeas, incomplete emergence failure obtained by all the extracts except P. rhoeas with percentage ranged between 18.2 to 8.0% for C. maculatus and A. dioscoridis and legs amputation after an adult left puparium with less than 9.8% for any the applied extracts. Treatment water bodies with plant extracts at LC₂₅ were disturbed 3^rd - pupal period, which increased to 19.75 and 16.0 days at extracts of C. maculatum and P. rhoeas, while it declined to 10.33 and 7.0 days at R. communis and A. dioscoroidis (control 13.5 days), while pupal – adult period significantly accelerated from 3.1 days in control to less than 2.0 days at C. maculatum, R. communis and A. dioscoridis extracts. In the present study, physiological and developmental effects of the plant extracts can give promising option in mosquito control and avoidance environmental pollution.