During which conditions should you not apply low volume sprays?

• A. During periods of low temperature or high humidity
• B. During periods of high wind speeds
• C. During periods of high temperature or low humidity
• D. During calm, cool mornings

Answer: (C)

Low-volume sprays depend on droplets that stay on or near the target leaf to provide good coverage. In hot and dry air, droplets evaporate quickly and become very fine. Those tiny droplets are more prone to drifting away with the air and may not deposit well on the plant, which reduces effectiveness and increases the risk of off-target movement. Some pesticides also volatilize more at higher temperatures, adding to the drift and off-target concerns. So, you should avoid low-volume sprays when it's hot or when the air is dry. Cooler, more humid conditions help droplets stay larger and deposit more effectively. High winds also worsen drift risk, while calm, cool mornings are generally more favorable for spraying.