Sitophilus zeamais and Prostephanus truncatus are two most important storage insect pests of
maize in Ghana and Africa as a whole. These insects cause weight loss of about 20 to 90 % of the
untreated stored maize seeds. The control of post-harvest pests largely depends on the use of
pesticides. Because of the adverse effects of insecticides on humans and the environment, attempts
are being made to discover remedies pest management. This study was to assess four plants
(Lantana camara, Moringa oleifera, Citrus sinensis and Hyptis suaveolens) extracts as maize seed
storage protectants against Sitophilus zeamais and Prostephanus truncatus in Ghana. The study
was laid out in a Completely Randomized Design (CRD) with three replications. Dried powders
at (5 and 10%) and aqueous extracts (0.05 and 0.1 g/mL) of botanicals were prepared and evaluated
for their insecticidal activity against P. truncatus and S. zeamais in treated maize seed. Untreated
control and seed maize grains treated with Actellic were included as checks. There was decrease
in oviposition and survivorship of insects was lowest when grains were treated with plant extracts
at egg stage compared to the control. There was reduction in the number of adult insects that
emerged at all developmental stages of the insects in treated maize seeds with methanol extracts
of botanicals. All plant extracts at 0.1 g/ mL showed significant (P<0.001) difference in repellency
compared to the control; however, H. suaveolens recorded the highest repellent activity to P.
truncatus and S. zeamais at 93.3 and 96.7% respectively. Maize seeds treated with L. camara and
M. oleifera recorded a percentage germination of 94.0 each followed by Actellic (93.0%), C.
sinensis and H. suaveolens (86.0%) and the control (82.0 %). Maize seeds treated with methanol
extracts of the botanicals after 10 weeks in cribs, recorded a reduction in percentage seeds damaged
and weight loss caused by the two insects as compared to the untreated seeds which recorded
higher number of damaged seeds and percentage weight loss. The phytochemical analysis revealed that compounds such as alkaloids, saponins, tannins and phenolic, steroids, flavonoids,
anthroquinones, phlobatinins, cardiac glycosides and terpenoids were recorded in all the four plant
extracts. These compounds may have caused lower progeny emergence, inhibitory effect, repellent
action and antifeedant effect to S. zeamais and P. truncatus in grains treated with the
botanicals.The study proposes that the botanicals tested have the potential in the growth of the
seed industry to enhance quality seed production. It is therefore recommended to be used by
farmers to control P. truncatus and S. zeamais in stored maize seed.
CDR, C (2021). Assessment Of Four Plant Extracts As Maize Seed Storage Protectants Against Sitophilus Zeamais And Prostephanus Truncatus In Ghana.. Afribary.com: Retrieved May 08, 2021, from https://afribary.com/works/assessment-of-four-plant-extracts-as-maize-seed-storage-protectants-against-sitophilus-zeamais-and-prostephanus-truncatus-in-ghana
Coalition, CDR. "Assessment Of Four Plant Extracts As Maize Seed Storage Protectants Against Sitophilus Zeamais And Prostephanus Truncatus In Ghana." Afribary.com. Afribary.com, 07 Apr. 2021, https://afribary.com/works/assessment-of-four-plant-extracts-as-maize-seed-storage-protectants-against-sitophilus-zeamais-and-prostephanus-truncatus-in-ghana . Accessed 08 May. 2021.
Coalition, CDR. "Assessment Of Four Plant Extracts As Maize Seed Storage Protectants Against Sitophilus Zeamais And Prostephanus Truncatus In Ghana.". Afribary.com, Afribary.com, 07 Apr. 2021. Web. 08 May. 2021. < https://afribary.com/works/assessment-of-four-plant-extracts-as-maize-seed-storage-protectants-against-sitophilus-zeamais-and-prostephanus-truncatus-in-ghana >.
Coalition, CDR. "Assessment Of Four Plant Extracts As Maize Seed Storage Protectants Against Sitophilus Zeamais And Prostephanus Truncatus In Ghana." Afribary.com (2021). Accessed May 08, 2021. https://afribary.com/works/assessment-of-four-plant-extracts-as-maize-seed-storage-protectants-against-sitophilus-zeamais-and-prostephanus-truncatus-in-ghana