Which factor does NOT contribute to runoff risk of pesticides?

Water temperature does not contribute to the runoff risk of pesticides because runoff is primarily influenced by physical attributes of the environment and the application practices involved. Soil texture plays a crucial role as it affects the permeability and retention of water and chemicals, with finer textures typically promoting runoff due to lower infiltration rates. Plant coverage is important as it can intercept rainfall and reduce the velocity of water, thus minimizing movement of pesticides into waterways. Application rate is also significant; higher application rates increase the likelihood of excess pesticides washing away during rain events. In contrast, while water temperature can affect the behavior of pesticides, such as their volatility or degradation rates, it does not directly impact how pesticides run off the surface of the soil into water bodies.