What is the most serious sunflower pest year after year?

What is the most serious sunflower pest year after year?

• A. Cutworms
• B. Sunflower headmoths
• C. Headclipping weevils
• D. Stem borers

Answer: (B)

The key idea is which pest tends to cause the most economic damage to sunflowers year after year. Sunflower head moths win this win because their larvae feed inside the developing head, directly destroying seeds and lowering both yield and seed quality. This “inside the head” feeding makes the damage harder to detect early and harder to salvage, and multiple generations can occur in a single season, so losses tend to recur across many seasons in many areas. Other pests can cause damage, but not with the same consistent, head-wide impact. Cutworms mainly affect young plants, so their damage is concentrated early rather than annually; headclipping weevils and stem borers can be troublesome in some fields, but their damage is typically less widespread or predictable in Kansas sunflowers, so they don’t dominate year after year like the head moth does.

The key idea is which pest tends to cause the most economic damage to sunflowers year after year. Sunflower head moths win this win because their larvae feed inside the developing head, directly destroying seeds and lowering both yield and seed quality. This “inside the head” feeding makes the damage harder to detect early and harder to salvage, and multiple generations can occur in a single season, so losses tend to recur across many seasons in many areas.

Other pests can cause damage, but not with the same consistent, head-wide impact. Cutworms mainly affect young plants, so their damage is concentrated early rather than annually; headclipping weevils and stem borers can be troublesome in some fields, but their damage is typically less widespread or predictable in Kansas sunflowers, so they don’t dominate year after year like the head moth does.