Spring weed control application.

Asked April 24, 2020, 11:09 AM EDT

Would April 28th be to soon to apply an application of weed control? Specifically using trimecc 992 plus urea in a blanket, liquid application. Would making this application have good efficacy even if the temperatures are only in the mid 50s? Thank you

Genesee County Michigan

1 Response

First of all , make sure you read and follow label instructions for using Trimec 992. I have attached copies of the SDS & Label .
SDS: https://www.domyown.com/msds/trimec_992_sds.pdf
Label: https://www.domyown.com/msds/trimec_992_label.pdf
This Purdue bulletin recommends spraying when weeds flower: https://www.extension.purdue.edu/extmedia/AY/AY-9-W.pdf
read also MSU bulletin: https://www.canr.msu.edu/news/in_case_you_missed_it_spring_lawn_care_practices
NDSU cold weather herbicide allocation recommendation: https://www.ag.ndsu.edu/winterstorm/winter-storm-information-farm-and-ranch-information1/farm-and-ra...
From these publications fall is the best time to spray herbicide on broadleaf weeds, but if spring spraying: daytime temperatures should be above 60 degrees F and weeds should be near the end of spring flowering. This spring started early in March but has fallen behind due to the cooler April temps. Looking at the weather forecast (24AP20 Flint Journal) for Flint it's not likely to hit 60 for a week, with showers too. Waiting a week or 10 days to spray shouldn't hurt the herbicide's effectiveness on broad leaf weeds. Be sure to make sure the trimec and urea remain thoroughly mixed while spraying and spray when there is no/minimal wind to eliminate spray drift onto desirable plants.