MDARD Michigan Core Pesticide Applicator Practice Exam

What increases the volatilization of pesticides?

1. Low air temperature

2. High moisture levels

3. High air temperature and air movement

4. Large droplet size

The correct answer is: High air temperature and air movement

The increase in volatilization of pesticides is significantly influenced by high air temperatures and air movement. When the temperature rises, the kinetic energy of the pesticide molecules also increases, which leads to a greater likelihood of these molecules escaping into the atmosphere in the form of vapor. Additionally, when there is air movement, it assists in dispersing the vaporized particles away from the application site, allowing for more rapid volatilization. In contrast, lower air temperatures can inhibit this process by reducing the energy of the pesticide molecules, making them less likely to vaporize. High moisture levels can also affect volatilization differently, as humidity may condense certain pesticide formulations, thereby reducing the rate at which they volatilize. Furthermore, larger droplet sizes generally fall to the ground more rapidly and are less likely to become airborne compared to smaller droplets, thus reducing their chances of volatilization. Overall, it is the combination of high temperatures and air movement that markedly enhances the volatilization process of pesticides.