When determining if two pesticides can be mixed, what is the first step in the testing process?

The correct first step in determining if two pesticides can be mixed involves filling a testing jar halfway with the carrier. This approach allows for a controlled environment to observe the initial interaction between the pesticides and the carrier (typically water or oil). It’s essential to begin with the carrier because the carrier is what will be used in the application process, allowing for a realistic assessment of how the pesticides will behave when mixed in the field.

By starting with the carrier in a testing jar, it provides a clear visualization of any immediate reactions or compatibility issues between the pesticides. This method can reveal issues such as sedimentation, separation, or the formation of precipitates, which can indicate incompatibility before proceeding to more complex mixing procedures, such as placing the mixture in a spray tank.

Testing with a spray tank is not advisable at the start because it involves larger volumes and could lead to waste or equipment contamination if the mixture is incompatible. Stirring vigorously or waiting for the mixture to settle are subsequent steps that might be taken after the initial compatibility has been assessed, but they should not precede the preliminary step of filling a testing jar with the carrier.