PHYTO-CHEMICALS OF SOME PLANT LEAF POWDER AS ANTI-INSECT AGENTS AGAINST MAIZE WEEVILS Sitophilus zeamais (Coleoptera: Curculionidae)

A. M. Abdullahi, A. Sarki, M. S. Hafizu, I. Z. Kunihya, A. A. Kolawole, I. Nassai, M. Y. Haruna

Abstract


Leaf powder of Purple dead nettle (Lamium purpureum), Nut grass (Cyperus retrorsus), Wild sage (Lantana camara), Sunflower (Helianthus annuus), Key lime (Citrus aurantifolia) and Queen of the night (Cestrum nocturnum) were screened for secondary metabolite constituents and insecticidal activity against Maize weevil (Sitophilus zeamais). 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. 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 S. zeamais. LD50 (g) showed that L. purpureum (3.5) was most toxic to S. zeamais followed by L. camara (3.9) and C. aurantifolia (4.7), also H. annuus (5.9) and C. retrorsus (5.9) were more toxic than C. nocturnum (9.3) which was least toxic to adults of S. zeamais. Therefore, these phyto-chemical constituents of plants powder have potential to be used as control agents of S. zeamais infestations and could be used as replacement or supplements to conventional chemical insecticides which price, availability and technology of applications may be out of reach to poor farmers.

 

Key words: Insecticidal activity, Powder, Phyto-chemical, Screening, Sitophilus zeamais


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