Why should herbicides be used with caution during extreme weather conditions?

Herbicides can degrade more quickly and lose effectiveness during extreme weather conditions, such as high temperatures, heavy rainfall, or drought. In very hot conditions, for example, some herbicides may break down faster due to increased microbial activity in the soil, leading to a reduced concentration of the active ingredient. Rainfall can wash away herbicides before they have had a chance to effectively penetrate the plant's system or settle into the soil. Conversely, in dry conditions, the lack of moisture might prevent herbicides from activating properly, resulting in poor weed control. This degradation leads to diminished performance and may require additional applications, which can increase the overall cost and environmental impact of pest control efforts. Therefore, understanding the effects of weather on herbicide efficacy is crucial for successful turf and ornamental management.