Is it advisable to store unused spray mixture in the sprayer for a couple of days?

Storing unused spray mixture in the sprayer for an extended period, even for a couple of days, is generally not advisable. Pesticidal formulations can degrade over time due to exposure to air, light, humidity, and temperature changes, which can reduce their efficacy. This degradation can lead to a diminished ability to control pests effectively, resulting in inadequate pest management and potential crop damage.

In addition, certain active ingredients may react with the materials in the sprayer, leading to potential contamination of future mixtures or even damaging the sprayer itself. It's also a risk for misapplication if a pesticide is left in the sprayer and then used later without proper knowledge of the mixture's stability or effectiveness.

Therefore, it is always best practice to clean the sprayer after use and avoid storing any unused mixture. This ensures that the equipment remains in good condition and ready for effective use during the next application.