Primo mixtures to avoid

The growth regulator Primo Maxx (trinexapac-ethyl) is an important turf management tool. But it can also create turf management problems if it is mixed with the most common type of turf fungicides — the DMI (demethylation inhibitor) fungicides.

This is because DMI fungicides have growth regulator-like qualities that are similar to those of Primo. That is, they both act to slow turf growth and produce a darker green color. Because of this, a mixture of Primo and a DMI fungicide…