When should granular pesticides be applied for optimal results?

The optimal time for applying granular pesticides is when the ground is dry and not compacted. This condition allows for better absorption and contact with the target pests present in the soil or on the surface where the granular pesticide is dispersed. A dry and uncompacted surface promotes the movement of the granules into the soil, facilitating effective pest management and ensuring that the pesticide can interact with the pests more readily.

When the ground is too wet or compacted, the efficacy of the granular pesticide can be significantly reduced. Wet conditions can lead to the granules either washing away before they can act on pests or clumping together, which would limit their spread. Compacted soil can hinder the penetration of the granules and prevent them from reaching pests adequately, rendering the application less effective.

The other options may not be ideal conditions for applying granular pesticides. Heavy rain can dilute or wash away the product, applying at high temperatures could lead to volatility or degradation of certain active ingredients, and nighttime applications, while they may address pest activity timing, do not necessarily provide the optimal soil conditions needed for effective pesticide action.