Effectiveness of the contact of certain plants extract Crataeva religiosa Forts, Azadirachta indica A Juss. And Senna occidentalis L. on Callosobruchus maculatus, a pest of stored cowpeas.
The effectiveness of the aqueous extract of the leaf powder of several plants (A. indica, S. occidentalis and C. religiosa) was tested in the laboratory on the external forms of C. maculatus, which is a formidable devastator of stored cowpea seeds. Our study revealed globally that, with any used plant, the induced mortalities were not proportional to the applied concentrations. Thus, all plants gave higher mortality with the application of the concentration C2 on the eggs, except C. religiosa. We also note a higher mortality of eggs with this same concentration, and with the application of the aqueous extract of the leaves powder A. indica (74.99%). All plants, except S. occidentalis (44.83%), gave mortalities above 50% with the application of C2 (0.13g / cm3). On C. maculatus adults, we note an effectiveness of the aqueous extract by maceration of C. religiosa leaf powder, which is greater than that of other plants (A. indica and S. occidentalis). The extract of S. occidentalis was also less effective on adults of C. maculatus. Consequent mortalities induced by this plant are not noticeable but on the 10th day of application. Indeed the two highest concentrations (C1 (0.2g/cm3) and C2 (0.13 g /cm3)) gave both mortalities of 87.25%, while the lowest concentration (C3 (0.1g/cm3)) Revealed mortalities not exceeding 74.87%.
In general, this formulation showed a greater adulticidal efficacy with C. religiosa, while eggs are more susceptible to A. indica.
These results suggest that the combination of aqueous extract of these plants would be an effective remedy for the use of synthetic insecticides in the control of pests of stored food.
Auteur(s) : Faye A., Diome T., Thiaw C. Sembène M.
Pages : 1-8
Année de publication : 2017
Revue : International Journal of Multidisciplinary Research Hub.
N° de volume : 4 (7)
Type : Article
Mise en ligne par : SEMBENE Mbacké