How does cool and dry weather influence pesticide degradation?

Cool and dry weather influences pesticide degradation by decreasing the breakdown of pesticides. In these conditions, the lower temperatures can slow down the chemical reactions that lead to pesticide degradation. Many pesticides degrade through processes such as hydrolysis, photodegradation, or microbial action, all of which tend to be less efficient in cool and dry conditions.

Cool temperatures can inhibit microbial activity, which is a significant factor in the biological degradation of pesticides. Furthermore, dry conditions reduce the amount of moisture, which is necessary for certain degradation processes, especially those that rely on water or microbial action. As a result, when temperatures are cool and humidity is low, pesticides can remain active and intact for a longer duration in the environment, thus decreasing their breakdown.