Use of Plant Ash Cocktails as Entomocides Against Callosobruchus maculatus and Sitophilus zeamais in Storage Systems

Use of Plant Ash Cocktails as Entomocides Against Callosobruchus maculatus and Sitophilus zeamais in Storage Systems

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Use of Plant Ash Cocktails as Entomocides Against Callosobruchus maculatus and Sitophilus zeamais in Storage Systems

CHAPTER ONE

INTRODUCTION

1.1 Background of the Study

Post-harvest losses caused by insect pests remain a major challenge to food security in many developing countries, particularly in sub-Saharan Africa. Two of the most destructive storage pests are the cowpea bruchid, Callosobruchus maculatus, and the maize weevil, Sitophilus zeamais. These insects attack grains during storage, leading to severe weight loss, reduced nutritional value, poor market quality, and in extreme cases, total loss of stored produce (Adedire & Lajide, 2001; FAO, 2017).

Conventional control of storage pests relies heavily on synthetic insecticides and fumigants. While these chemicals are effective, their continuous use has resulted in several problems, including insect resistance, environmental contamination, high cost, and risks to human health (Isman, 2006; Pimentel, 2005). In addition, poor regulation and misuse of chemicals in rural storage systems increase the likelihood of pesticide residues in food.

As a result, attention has shifted toward eco-friendly, affordable, and locally available pest control methods. Botanical materials and traditional storage practices have gained renewed interest. Among these, plant ashes have been used traditionally by farmers as protectants against insect pests in stored grains. Plant ash acts by desiccating insects, blocking spiracles, and interfering with feeding and oviposition (Lale, 2002; Golob et al., 1999).

Recent studies suggest that combining ashes from different plant sources into “entomocidal cocktails” may enhance insecticidal efficacy through synergistic effects (Udo, 2011; Adedire et al., 2014). Such cocktails could provide a low-cost, sustainable alternative to chemical insecticides for controlling C. maculatus and S. zeamais in storage systems.

This study therefore focuses on evaluating the effectiveness of plant ash-based entomocidal cocktails for controlling C. maculatus and S. zeamais in stored cowpea and maize.

1.2 Statement of the Problem

Despite efforts to improve post-harvest storage, losses due to insect infestation remain unacceptably high. Callosobruchus maculatus and Sitophilus zeamais cause rapid deterioration of cowpea and maize grains, especially under traditional storage conditions (Lale, 2002; FAO, 2017).

Although synthetic insecticides are widely used, their drawbacks—including resistance development, health hazards, and environmental pollution—limit their long-term sustainability (Isman, 2006; Pimentel, 2005). Small-scale farmers often lack access to safe and affordable chemical control options, leading to the need for locally sourced alternatives.

While plant ash has been reported to possess insecticidal properties, limited empirical studies have evaluated the combined use of different plant ashes as entomocidal cocktails against both C. maculatus and S. zeamais. There is therefore a need to assess the effectiveness of such plant ash-based formulations for protecting stored grains.

1.3 Objectives of the Study

General Objective:

To assess the effectiveness of plant ash-based entomocidal cocktails in controlling Callosobruchus maculatus and Sitophilus zeamais in stored grains.

Specific Objectives:

To formulate entomocidal cocktails using ashes from selected plant materials.

To evaluate the mortality effect of the ash cocktails on C. maculatus and S. zeamais.

To determine the effect of the ash cocktails on oviposition and grain damage.

To compare the efficacy of different ash combinations in protecting stored cowpea and maize.

To assess the potential of plant ash cocktails as alternatives to synthetic insecticides.

1.4 Research Questions

Can plant ash-based cocktails effectively control C. maculatus and S. zeamais in storage?

What is the mortality rate of the pests when exposed to different ash combinations?

Do plant ash cocktails reduce oviposition and grain damage?

Which ash formulations are most effective against each insect species?

How do ash cocktails compare with untreated controls in protecting stored grains?

1.5 Significance of the Study

This study is significant in several ways:

Farmers: Provides affordable and locally available pest control methods.

Researchers: Contributes to knowledge on botanical and non-chemical pest management.

Policy Makers: Supports sustainable agriculture and reduced dependence on synthetic pesticides.

Environmental Protection: Promotes eco-friendly storage pest control practices (Isman, 2006).

Food Security: Helps reduce post-harvest losses and improve grain availability (FAO, 2017).

1.6 Scope of the Study

The study focuses on the use of plant ash-based entomocidal cocktails for controlling Callosobruchus maculatus in cowpea and Sitophilus zeamais in maize under storage conditions. It emphasizes insect mortality, oviposition, and grain damage but does not cover field crop protection.

1.7 Operational Definition of Terms

Plant Ash: Residue obtained after burning plant materials, used as a traditional pest control agent.

Entomocidal Cocktails: Mixtures of different plant ashes formulated to kill or suppress insect pests.

Callosobruchus maculatus: A major storage pest of cowpea.

Sitophilus zeamais: A primary storage pest of maize.

Grain Storage: The keeping of harvested grains for future use or sale.

Mortality Rate: Percentage of insects killed after treatment application.

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