Which of the following is a correct non-toxic control option for two-spotted spider mites?

• A. Horticultural oil
• B. Systemic insecticide
• C. Pyrethrin spray
• D. Copper fungicide

Answer: (A)

Non-toxic control options for two-spotted spider mites rely on methods that physically disrupt or suffocate the pests rather than systemic chemical toxicity. Horticultural oil works by coating the mites and their eggs, blocking respiration and suffocating them when applied to the plant surfaces. When used according to label on healthy plants, it provides mite suppression with relatively low risk to humans, pets, and many beneficial insects, making it a preferred non-toxic option in ornamental and turf settings. In contrast, a systemic insecticide moves through the plant and can affect non-target organisms, including beneficials and pollinators, and is not considered non-toxic. A pyrethrum spray is broad-spectrum and toxic to many beneficial organisms; it can also lead to mite population rebounds if natural enemies are killed. Copper fungicide targets fungal diseases, not mites, so it won’t control two-spotted spider mites. Thus, horticultural oil is the appropriate non-toxic choice for mite control.