Which type of applications for Devrinol 50-DF ornamental are preferred when irrigation is not available?

Devrinol 50-DF is a pre-emergent herbicide commonly used in ornamental and turf practices. When considering application timing, it is essential to understand how the product interacts with environmental conditions, particularly moisture availability.

The preference for fall through spring applications is influenced by the life cycle of weeds and the effectiveness of the herbicide. During these months, soil temperatures are typically lower, and the potential for rainfall or dew is higher, which helps in activating the herbicide in the soil. Since irrigation is not available, relying on natural moisture from atmospheric conditions during fall through spring applications ensures that Devrinol can establish a protective barrier against germinating weeds effectively.

In contrast, summer applications might not be as effective due to the higher soil temperatures and potentially lower surrounding moisture levels. Winter applications may not be practical either, as the herbicide could be less effective in cold soil conditions, where weed seed germination is minimal. Continuous applications can lead to issues with herbicide resistance and are not a recommended practice for optimal pest management.

Thus, targeting applications during the fall through spring aligns with the herbicide's activation needs and environmental conditions, making it the preferred choice when irrigation is unavailable.