Spring Broadleaf Herbicide Timer

Suggested Timing:
Ester Formulations:110-150
Ester/Amine Formulations:150-200
Amine Formulations
: 200-600
Source: Schleicher, Throssell, Reicher, and Weisenberger (1995)

Broadleaf weeds are best controlled in fall. However, spring applications are often employed by many homeowners and lawn care providers. In cooler temperatures, amine formulations are less effective than ester formulations. However, later in the spring, as landscape plants are flowering and air temperatures are warmer, amine formulations are more effective. This model identifies the optimum timing for the ester, amine, and combination formulations.