Which of the following are pests targeted by insecticide seed treatments?

• A. Pythium
• B. Fusarium
• C. Rhizoctonia solani
• D. Rootworms

Answer: (D)

Insecticide seed treatments are designed to protect seeds and young seedlings from insects that feed on the seed or roots. They aim to reduce early-season insect damage and help the plant establish a strong stand.

Rootworms are the pests targeted by these treatments because their larvae feed on roots, causing significant stand reductions and yield loss if not controlled early. Applying an insecticide to the seed helps suppress these root-feeding larvae as soon as they hatch, protecting the root system and supporting better emergence and early growth.

Pythium, Fusarium, and Rhizoctonia solani, on the other hand, are fungal pathogens that cause seedling diseases like damping-off and root rot. These are not controlled by insecticides; they’re addressed with fungicide seed treatments, resistant varieties, and good cultural practices. So rootworms are the correct focus for insecticide seed treatments.