Mixing Order is Important

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

As we try to maximize the trips across the field, more and more products are being tankmixed together. Sometimes tankmixtures are not recommended due to a loss of efficacy when certain products are used at the same time and this is referred to as antagonism. An example of this is tankmixing glyphosate with triazine herbicides while trying to control Italian ryegrass. Another example is tankmixing 2,4-D with clethodim, which reduces grass control.

Sometimes tankmixtures do not blend well and you can end up with a gunky mess in the tank. This can often be avoided by mixing in the proper order. Most herbicides have directions on their label for the proper mixing order; unfortunately, these directions may not address all the products you want to include. Looking over numerous herbicides and the recommended order, here is a generalized mixing list. Remember, first refer to the label and if something is not listed, this list can provide some guidance.