Illinois Pesticide Applicator Practice Test

When does the potential for spray drift increase significantly?

When humidity is low When wind velocity is greater than 10 miles per hour When temperatures are high When applying during evening hours

Correct Answer:

When wind velocity is greater than 10 miles per hour

Explanation:

The potential for spray drift increases significantly when wind velocity is greater than 10 miles per hour because wind can carry pesticide particles away from the intended target area. When wind speed exceeds this threshold, it becomes more challenging to control the direction and distribution of the spray, leading to unintended applications on non-target areas. This not only reduces the effectiveness of the pesticide but can also pose risks to nearby crops, wildlife, and the environment. Therefore, it is crucial for applicators to monitor wind conditions and avoid spraying during high wind events to minimize the risk of drift.

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