Washington Pesticide Laws and Safety Practice Test

When are pesticides considered incompatible?

1. When they can be tank mixed without any problems.

2. When they require a specific kind of solvent to mix.

3. When mixing results in chemical or physical separation, like clumping or gels.

4. When they enhance each other's effectiveness beyond expected levels.

The correct answer is: When mixing results in chemical or physical separation, like clumping or gels.

When pesticides are considered incompatible, it means that they are not able to properly mix together. This can result in clumping or gelling, which can affect the effectiveness of the pesticides. Option A is incorrect because if pesticides can be tank mixed without any problems, then they are considered compatible. Option B is incorrect because requiring a specific type of solvent to mix is not necessarily a sign of incompatibility, it just means that a certain solvent is needed for proper mixing. Option D is incorrect because when pesticides enhance each other's effectiveness, they are still considered compatible. Incompatibility is only when there is an issue with mixing them together.