An edible plant-extract-based insecticidal composition comprises d-limonene, a non-toxic hydrophilic solvent, and an amount of a polyethoxylated castor oil sufficient to solubilize the d-limonene in the hydrophilic solvent. The castor oil is both an emulsifier and an active ingredient having insecticidal efficacy. The insecticidal composition is non-toxic to humans and household animals.