What is the first step in the control of any turf grass disease?

• A. Accurate diagnosis
• B. Apply fungicide
• C. Watering
• D. Mowing

Answer: (A)

Accurate diagnosis is the first step because you must know exactly what is affecting the turf before choosing a control plan. Many problems look alike, and misidentifying a disease can lead to wasted treatments, unnecessary cultural changes, or making the problem worse. By confirming the exact disease (or ruling out a disease entirely), you can select the right management approach and timing.

Diagnosis involves more than just looks. It includes noting the pattern of symptoms across the turf, the host species and growth stage, recent weather and irrigation, fertilizer or traffic history, and any signs of the pathogen itself (such as distinctive spots or fungal structures). When needed, collecting samples for careful examination or lab confirmation helps ensure the problem isn’t an abiotic issue like poor drainage, nutrient deficiency, or pH imbalance.

Once you have a solid diagnosis, you tailor the response. This may include cultural practices that remove or reduce the conditions that favor disease—like adjusting irrigation to avoid prolonged leaf wetness, improving drainage and air flow, mowing at appropriate heights, and avoiding practices that promote excessive lush growth. If a chemical control is appropriate, you choose a fungicide that targets the identified pathogen and use it according to label directions, with attention to timing and resistance management.

Watering and mowing affect disease risk and are part of the control plan, but they aren’t the starting point on their own. Starting with an accurate diagnosis ensures the actions you take actually address the cause.