Susceptibility of Sitophilus Zeamais Mots. and Callosobruchus Maculatus F. to Plant Parts of Ricinodendron Heudelotii

Abstract

Studies were carried out in the laboratory to determine the efficacy of powders from plant parts of Ricinodendron heudelotii against the storage pests Sitophilus zeamais and Callosobruchus maculatus on stored maize and cowpea, respectively. Leaf, bark and root powders were added as admixtures to 100 g of grains to assess contact toxicity, damage assessment, progeny production and grain germination. Results indicated that the plant materials were toxic to the two insect species with over 30% and 75% mortality for S. zeamais and C. maculatus, respectively. Observable damage level was significantly (p ≤ 0.05) lower in treated grains while progeny production by both insect species was significantly (p ≤ 0.05) reduced. Grain germination of both crops was not affected by the powders. The potential use of P. heudelotii in storage pest management is discussed.

Efficacy of <i>Cymbopogon citratus</i> Stapf leaf extract as seed protectant against <i>Sitophilus zeamais</i> Motschulsky (Coleoptera: Curculionidae) on stored maize (<i>Zea mays</i> L.)

“…This is probably due to the possession of strong elytra that covers the entire abdomen of the insect. This confirmed earlier works by Inyang (2004), Akpabot et al(2010) and Edelduok et al (2012) who posited that coleopterans have exceptionally thick cuticles, epidermis and basement membrane as effective mechanisms of restricting toxicants absorption but disagreed with earlier work by Epidi et al (2009), Denloye et al (2010) and Udo et al(2011) who observed significant contact action on S. zeamais since they are known to be poor fliers and so were always in contact with the treated filter paper. Again, the body size of S. zeamais might enhance its efficiency in detoxifying any toxic materials in the plant product applied.…”

Oviposition Deterrent and Egg Hatchability Suppression of Secamone Afzelii ( Schult ) K. Schum Leaf Extract on Callosobruchus Maculatus ( Fabricius ) ( Coleoptera : Chrysomelidae )

“…Leaves of S. afzelii were obtained from Ipesi Akoko, Ondo State, Nigeria and air-dried under a room temperature for about 2 weeks to avoid possible volatilization of the active ingredients (Adesina, 2012). The dried leaves were milled into powder using a hammer mill (Epidi et al, 2009). Thereafter, the milled leaf powder of S. afzelii was taken to the laboratory for extraction using ethanol and n-hexane as organic solvent using soxhlet apparatus.…”

Control of Sitophilus zeamais (Motsch) [Coleoptera: Curculionidae] on Sorghum Using Some Plant Powders

“…zeamais feeds on cereals and starch grains including guinea corn, Sorghum bicolor (L) (Effraim, 1996;PaDIL, 2009). The economic importance and wide distribution of Sitophilus species have prompted many researchers to go into studies on various aspects of the weevils, especially S. zeamais (Udo, 2005;Asawalam and Emosairue, 2006;Abulude et al, 2007;Asawalam et al, 2007Asawalam et al, , 2008Ousman, et al, 2007;Parugrug and Roxas, 2008;Efidi et al, 2009;Danjumma et al, 2009;Owolabi et al, 2009;Makate, 2010).…”