Response of Pratylenchus spp. infected tomato (Lycopersicon esculentum Mill) to organic compounds from Mangifera indica.
Fabiyi O. A., Olatunji G. A., Oguntebi O. V.
Author Affiliation: Department of Crop Protection, Faculty of Agriculture, University of Ilorin, Ilorin, Nigeria.
Ethiopian Journal of Environmental Studies and Management 8 : 387-397
Abstract : The need to reduce the negative impact of synthetic nematicides on the environment necessitated the search for bio-pesticides. This study was conducted to evaluate the nematicidal potential of chromatographic fractions from Mangifera indica on tomato in the screenhouse and field. M. indica bark was extracted with ethanol (EtOH) and dichloromethane (DCM). The crude extracts were chromatographed and fractionated on silica-gel (100-120 mesh) column. Fractions were tested at 0.2, 0.5 and 0.8 mg in the screenhouse and 12, 18 and 24 mg on the field. Vegetative growth was significantly (p0.05) higher in plants treated with the highest concentration of fractions. There was a significant increase in number of fruits per plant and fruit weight per plant. Nematode population in soil and root also reduced significantly. The fractions were partially characterised and were found to contain fatty acid esters, hydrocarbons, terpenoids, flavonoids, alkaloids, acids, esters, aldehydes and ketones. Observed reduction in nematode population is a clear indication that M. indica bark extract is an effective agent against nematode infestation.