Eugenia aromaticaO. Berg andAfromomum meleguetaK. Schum botanical entomocides as possible synergetic protectant againstCallosobruchus maculatus(Fabricus) (Coleoptera: Chrysomelidae) infestation on stored cowpea (Vigna unguiculata(L.) Walp.)

Abstract

Summary Introduction: Post-harvest protection of food grains against stored products insects’ infestation is a complementary means towards ensuring food security. Objective: Powders and extracts from Eugenia aromatica O. Berg and Aframomom melegueta K. Schum are to be evaluated for their synergetic effects on Callosobruchus maculatus Fabricus under laboratory conditions. Methods: The products were applied at rates of 1 g/20 g and 1% conc./20 g cowpea seeds respectively. Results: Findings show that E. aromatica products was more effective by evoking 100% mortality within 24 and 48 h, while synergetic effects of the two products evoked 100% mortality at 72 and 96 h. The survival of the bruchids treated with plant powder from eggs to adults indicated that, control had significant (p<0.05) progeny development (75.50%) in comparison with sole application of E. aromatica and combination with A. melegueta which recorded no progeny development. Conclusion: The study revealed that the plant products exerted toxicity effect against cowpea bruchid. Thus, they can be used to prevent egg hatching and thereby helping in the management of cowpea seeds.

Seed preservatives properties of Secamone afzelii (Schult) K. Schum extracts on wheat grains damage and germination capability

“…Grain protectants play vital role in extending the storability of seeds to longer duration without appreciable loss in vigor and viability (Adesina et al 2019a). The findings obtained in this study showed that S. afzelii extracts are effective as stored grains protectant against storage insects in reducing grain damage and ultimately lower weight loss.…”

“…The effect of S. afzelii extracts on germination of treated wheat samples was determined following the method of Adesina et al (2019a). Damaged and undamaged grains carefully separated, 20 g of wheat grains in each of the fumigated and contact toxicities groups were randomly selected from the undamaged ones and placed on moistened tissue paper in sterilized Petri plates as the growth medium and allowed to germinate at room temperature.…”

“…A number of insect pests induced deleterious effects on cereal grains/seeds post-harvest management. Among the key insect pests of stored cereal grains are the coleopteran beetles, namely: Granary weevil, Sitophilus granarius (Linnaeus), maize weevil, S. zeamais (Motschulsky), rice weevil S. oryzae (Linnaeus), red flour beetle, Tribolium castaneum (Herbst), Angoumois grain moth, Sitotroga cerealella (Olivier) and Lesser grain borer, Rhyzopertha dominica (Fabricus), and cause substantial grains perforation or damage, weight loss, alteration of nutritional quality, decreased germination potential and leading to colossal economic losses due to reduction in the marketable worth of the seed (Adesina et al 2019a(Adesina et al , b, 2020Adesina and Mobolade-Adesina 2020).…”