COMPARATIVE EFFICACY ANALYSIS OF INSECTICIDAL AND REPELLENCY PROPERTIES OF HYMENOCARDIA ACIDA WOOD ASH AND DIATOMACEOUS EARTH AGAINST SITOPHILUS ZEAMAIS (MAIZE WEEVIL)
Keywords:
Insecticidal, Repellency, Food Security, Hymenocardia acida, Sitophilus zeamais, Diatomaceous earthAbstract
Stored product insect pests are problems throughout the world, as they diminish both the quantity and quality of grains. The resultant effect of this is an imminent threat to food security which might negatively impact our wellbeing. The maize weevil, Sitophilus zeamais is an insect pest which has spread all over the world, and causes damage to maize grains and other species of stored cereal. The aim of this study was to investigate the insecticidal efficacy and repellency properties of H. acida tree against the weevil on a 14 day exposure and trial. The study involved the use of treatment doses of 2g, 4g and 6g for H. acida and 0.5g, 1g, and 1.5g were used for diatomaceous earth as the Positive Control. Results showed that mortality was dose dependent, and there was a significant difference in mortality rates of the weevil across all treatments (P˂ 0.05). The treatment doses of HA ash significantly induced 94.17% mortality within the study period, and highest percentage progeny inhibition of 44.44% compared to DE with 27.78%. The study also recorded that HA ash showed the best efficacy in terms of grain damage (1.67%) and weight loss (0.92%). A highest repellency of 80% was observed in the treatment with 30% aqueous solution of H. acida ash than the control (70%). The study recommends that wood ash from H. acida could best be used as alternative method to reduce grain infestation and improve food security.
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