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In this study, leaves powder of Lamium purpureum, Cyperus retrorsus, Lantana camara, Helianthus annuus, Citrus aurantifolia and Cestrum nocturnum were screened for secondary metabolite constituents and insecticidal activity against Cowpea weevils (Callosobruchus maculatus).Phytochemicals screening of the powder revealed the presence of alkaloids, terpenoids, flavonoids, tannins, saponnins, phytosteroids, phenolic compounds, proteins and aminoacids, oil and fats as well as reducing sugars in the plants investigated. Alkaloids were absent only in C. retrorsus, H. annuus and C. nocturnum, Flavonoids were absent in L .purpureum, C. retrorsus, H. snnuus and C. nocturnum, Terpenoids were absent in C. retrorsus and C. nocturnum, saponnins were absent in C. retrorsus only, Phenolic compounds were absent only in H. annuus, Phytosterols were absent in L.purpureum, C. retrorsus and C. nocturnum. Proteins and amino acids were present only in L. purpureum and H. annuus. Oil and fats were absent in C. retrorsus and C. nocturnum while reducing sugars were absent in L. purpureum, C. retrorsus and C. nocturnum. The plants powder indicates insecticidal activity in a dose dependent manner, higher doses has stronger effect, all the experimental plants caused significant mortalities (p<0.05) of the C. maculatus. LD50 (g) showed thatH. annuus (6.2)andC .nocturnum (6.2) were most toxic to C. maculatus than L. purpureum (9.7), C. aurantifolia (12.8) andL. camara (12.8) were more toxic than C. retrorsus (18.2) which was least toxic to adults of C. maculatus. Therefore, these phytochemical constituents of plants powder have potential to be used as control agents of C. maculatus infestations and could be use as replacement or supplements to conventional chemical insecticides which price, availability and technology of applications may be out of reach to poor farmers.

Phyto-Chemicals of Some Plants Powder as Anti-Insects Agents against Cowpea Weevils Callosobruchus Maculatus Coleoptera: Bruchidae