DefinePK

Abstract

Aim: The study aims to evaluate the phytochemical properties of M. oleifera dry roots and bark, with the view of determining the pesticidal efficacy on insect pests. Laboratory and field studies were conducted to test the insecticidal effect of powdered preparation of M. oleifera parts on major insect pests of okra.
Materials and Methods: Fifty grams (50g) of powdered preparations of different plant parts and their combination were mixed separately with water and applied on the okra plant using a dispenser. Data were collected before and after 1st and 2nd application of plant substance.
Results: This revealed four orders, seven families and seven species of insect pests including whiteflies, aphids, beetles, mealy bug, wingless grasshoppers, leaf-rollers, and fruit-borers, as the common pests responsible for damage at different stages of the crop growth. The highest counts (36.52%) in aphid infestation and occurrence were found in Calabar South compare to Biase which was the least. Highest mealy bug counts were observed in Akpabuyo (37.78%) and least (10.49%) in Biase. Results also revealed substantial decrease in infestation level in plots treated with bark powder preparation (37.52%), and combine powder preparation (37.75%). Root powder preparation was not as effective in reducing pest population.
Conclusion: Bark powder preparation is therefore recommended for the control of okra pest both in the field and during storage as this is readily available and economical. It can serve as suitable alternatives to synthetic chemicals in insect pest control and management of stored grains.