Which of the following can resemble insect damage to turf grass?

• A. Improper mowing
• B. Fertilizer burn
• C. Improper pesticide use
• D. All of the above

Answer: (D)

Symptoms on turf that look like insect damage can come from several unrelated stresses, not just pests. If mowing is done too short or with dull blades, the turf can be scalped and stressed, producing brown patches and ragged-looking leaves that resemble chewing or feeding damage. Fertilizer burn, from applying too much or using the wrong formula, can cause leaf tip burn and scorch, creating patches that mimic insect-fed turf. Improper pesticide use, such as over-application, mixing errors, or drift, can injure the grass itself, leading bleaching, browning, or stunted growth that can be mistaken for insect activity. Because each of these scenarios can produce similar symptoms, the best choice is all of the above. When diagnosing, look for actual pests and corroborating signs (pest presence, feeding patterns) alongside maintenance mistakes to distinguish the true cause.