Effectiveness of botanical powders against Callosobruchus maculatus (Coleoptera: Bruchidae) in some stored leguminous grains under laboratory conditions

  • Felicia Nkechi Ekeh
  • Ikechukwu Eugene Onah
  • Chinedu Ifeanyi Atama
  • Njoku Ivoke
  • Joseph Effiong Eyo

Abstract

The study investigated the comparative efficacy of some botanicals (Aframomum melegueta (K. M. Schumann) seed, Capsicum nigrum (L.) seed, Allium sativum (Woodwill) bulb, Zingiber officinale (Roscoe) rhizome, Azadiracta indica (A. Juss) leaves and Ocimum gratissimum (L.) leaves) and pirimiphos methyl powder in the suppression of Callosobruchus maculatus (Fabricius) damage in some stored legume (Vigna unguiculata (L.), Vigna subterranea (L.) and Cajanus cajan (L.) seeds. The botanicals were applied at the rate of 0 and 1 g. The pirimiphos methyl powder was applied at 0.1 g. The experiment was laid out in split plot design of eight treatments replicated ten times. Five pairs of one-day old adult C. maculatus were introduced into each jar. Mortality of adult C. maculatus was recorded daily. O. gratissimum was more effective in causing C. maculatus mortality. The LD50 revealed O. gratissimum powder to be the most effective biopesticide. All treatments recorded higher significant (p<0.05) mortality than the experimental control. The proximate analysis of the legumes revealed that the protein content of V. unguiculata was more than others. The phytochemical analysis revealed that alkaloids, steroids, glycosides and terpenoids were present in the botanicals. Out of the six botanicals investigated, O. gratissimum powder was the most effective biopesticide and thus recommended.

Keywords: Botanical powders, phytochemicals, Callosobruchus maculatus, stored leguminous grains, mortality, proximate composition

African Journal of Biotechnology Vol. 12(12), pp. 1384-1391

Author Biographies

Felicia Nkechi Ekeh
Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, Enugu State, Nigeria
Ikechukwu Eugene Onah
Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, Enugu State, Nigeria
Chinedu Ifeanyi Atama
Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, Enugu State, Nigeria
Njoku Ivoke
Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, Enugu State, Nigeria
Joseph Effiong Eyo
Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, Enugu State, Nigeria
Published
2016-01-17
Section
Articles

Journal Identifiers


eISSN: 1684-5315