Growth Inhibitory Activity of 6-Methoxyageratochromene on Culex-Quinquefasciatus (Diptera : Culicidae)

Abstract

During present study it was recorded that 6-methoxy ageratochromene isolated from whole herb acetone extract of Ageratum conyzoides inhibits the growth and moulting in the second and fourth instar larval treatment of Culex quinquefasciatus. When the plant extract were applied topically, the average pupal period prolonged significantly (p < 0.05) as compared to those of the control. Fourth stage larvae just prior to metamorphosis were most sensitive. Mortality in larvae, pupae and during ecdysis brings about a considerable fall in population. This growth index was found to be reduced in Ageratum conyzoides (P < 0.01) compared to the control.

Keywords

• Growth disrupting
• ecdysis
• morphogenetic
• aberration
• precocene