How can weather changes during an application affect pesticide effectiveness?

Sudden rain can wash away pesticide, significantly impacting its effectiveness. When pesticides are applied to crops or soil, they need a certain amount of time to adhere to the target surface and penetrate effectively. If rain falls shortly after application, it can cause the pesticide to dissolve and be washed away, reducing the concentration that remains for pest control. This dilution can lead to ineffective treatment, as the intended dosage necessary for pest management may not reach the crops or soil.

Other factors like wind, temperature, and dryness play roles in how pesticides act but do not necessarily reflect the same level of immediate impact as rain. For instance, wind can lead to uneven application coverage and drift, while temperature can affect the volatility and absorption of pesticides. In contrast, while dry weather may assist in drying the pesticides quickly, it does not compensate for the washing away that can occur with sudden rain.