Which practice helps avoid phytotoxicity when applying pesticides?

Which practice helps avoid phytotoxicity when applying pesticides?

• A. Do not treat stressed plants
• B. Treat stressed plants
• C. Apply at maximum rate
• D. Apply during extreme heat

Answer: (A)

Avoiding phytotoxicity hinges on not applying pesticides to plants that are stressed. When turf is under stress—such as from drought, heat, nutrient deficiency, or disease—the tissues are more vulnerable to chemical injury. Stressed plants often have impaired barriers and altered physiology, so pesticides can be taken up and moved in ways that cause leaf burn, bleaching, or growth problems. Waiting until the plant is healthy or conditions are favorable reduces this risk. The other options would raise the chance of injury: treating stressed plants adds chemical stress; using the maximum rate delivers more chemical to the plant; applying during extreme heat increases uptake and damage potential.

Avoiding phytotoxicity hinges on not applying pesticides to plants that are stressed. When turf is under stress—such as from drought, heat, nutrient deficiency, or disease—the tissues are more vulnerable to chemical injury. Stressed plants often have impaired barriers and altered physiology, so pesticides can be taken up and moved in ways that cause leaf burn, bleaching, or growth problems. Waiting until the plant is healthy or conditions are favorable reduces this risk.

The other options would raise the chance of injury: treating stressed plants adds chemical stress; using the maximum rate delivers more chemical to the plant; applying during extreme heat increases uptake and damage potential.