EXTRACTION FRACTIONS OF GINGER (ZINGIBER OFFICINALE ROSCOE) AND RESIDUE IN THE CONTROL OF FIELD AND STORAGE PESTS
1Amuji, C.F., B.C. Echezonaand 2Dialoke, S.A,
1 Department of Crop Science, University of Nigeria, Nsukka, Nigeria
2 School of Agriculture and Agricultural Technology, Federal University of Technology, Owerri, Nigeria
E-mail: chineduamuji@yahoo.com or felix.amuji@unn.edu.ng
ABSTRACT
Field and laboratory studies were carried out to evaluate the efficacy of six aqueous extraction rates ( 5%, 10%, 15%, 20%, 25% and 30%) of ginger and residues in the control of okra flea beetles and cowpea bruchid (Callosbruchus maculatus F.) respectively, in Nigeria. The field experiment was a randomized complete block design, with three replications. Laboratory experiment was laid out in a completely randomized design with four replications. Attacke 2.5 EC ® (lambdacyhalothrin) treated and untreated plots were used as field controls. Actellic 2% dust ® (pirimiphous methyl) treated and untreated grains constituted the controls of the laboratory experiment. Podagrica uniforma (Jacoby) and Nisotra sjostedti (Jacoby) populations were significantly (P<0.05) reduced in the field at different ginger extractions rates compared with the untreated. Lambdacyhalothrin treated plots significantly (P<0.05) produced a better yield than the untreated, while plots with higher rates of ginger (20%, 25%, and 30%) significantly (P<0.05) performed better than their lower rates and untreated plots. Okra fruit weight per plant was increased by 29% with 20% concentration; 43% by 25% concentration and 44% by 30% concentration relative to the untreated check. Higher concentrations of ginger residue (20%, 25%, and 30%) provided better protection against C. maculatus adult emergence compared to the untreated control. Fresh ginger extracts and its residues could therefore be harnessed in pre-and post-harvest pest control options respectively.
Keywords: cowpea bruchids, efficacy, flea beetles, plant protectants, pre- and post-harvest losses.