What is the recommended method to determine if you can mix two pesticides when information is unavailable?

The recommended method to determine if two pesticides can be mixed safely when information is not readily available is through a jar test. This method involves taking a small amount of each pesticide and mixing them in a container, typically a clear jar, to visually assess the reaction. During this test, one observes for any signs of incompatibility, such as precipitation, separation, or unusual coloration, which can indicate that the pesticides should not be mixed together.

The jar test is advantageous because it allows applicators to evaluate the physical compatibility of the two products without affecting larger volumes of pesticides and without the need for extensive testing in the field. It's a simple and effective preliminary step that helps prevent potential issues in the field, including reduced efficacy or increased phytotoxicity.

Other application methods like band application, broadcast application, and basal application pertain to how pesticides are applied in the field but do not specifically address the compatibility between different pesticide mixtures. These methods focus more on application strategies rather than the chemical interactions of the products being used.