<span style="font-size: 21.5pt;mso-bidi-font-size:14.5pt;font-family:"Times New Roman","serif"">Efficacy of crude extracts of <i>Andrographis paniculata </i>Nees. on <i>Callosobruchus chinensis </i>L. during post harvest storage of cowpea </span>

Abstract

<span style="font-size: 15.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""="">Bioefficacy of different solvent fractions of A. <i>paniculata </i>was tested against the cowpea weevil, <span style="font-size:16.0pt;mso-bidi-font-size:9.0pt; font-family:" times="" new="" roman","serif""="">C. <i><span style="font-size: 15.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""="">chinensis </span></i><span style="font-size:15.5pt;mso-bidi-font-size:8.5pt;font-family: " times="" new="" roman","serif""="">in terms of its effect on adult mortality, total egg output and emergence of F₁ adults. All the extracts were effective against the weevil, the efficacy was however more significant with respect to methanol and ethyl acetate extracts at the highest concentrations (1000 ppm) which lead to 72.01 and 67.69% adult mortality respectively. The efficacy was dose dependent. Total egg and percent emergence of Fl adults were lowest for methanol followed by ethyl acetate fractions. Possible role of the principal chemical constituents of this plant in bringing about mortality of the pest, reduction in egg laying and adult emergence are discussed.

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