Hello, thanks in advance. Currently in 7b/8a transition zone (Bham Alabama). I have Bermuda however several types of grass have been popping up as the Bermuda is dormant. I did do pre emergent several months ago but it doesn’t seem to have worked. I sprayed Celsius about 2 weeks ago but still not seemed to work. Any advice on post emergents that I can use on it? Or is it too late?
by hagmanse
5 Comments
The common lawn pre-emergents (prodiamine, pendimethalin, and dithiopyr) work to help reduce the germination of certain seeds… Mostly grasses and only a handful of broadleaf weeds. The labels will list which weeds are targeted. To prevent more broadleaf weeds, a specialty broadleaf pre emergent like isoboxen is required.
Pre-emergents work by preventing the germination of seeds of the target species. So in order to be effective, a pre emergent needs to be applied BEFORE those seeds germinate. For winter annual weeds (annual weeds that are present in the fall, winter, and spring, like poa annua), a pre emergent needs to be applied in the fall before soil temps fall below 70F. In order to prevent summer annual weeds (like crabgrass), a pre emergent needs to be applied in the spring before soil temps reach 55F. (In very southern areas, timing can be more closely tied with periods of higher moisture AND climbing soil temps. Consult your state extension service for more specific guidance)
Pre emergents will not kill existing weeds. Pre-emergents alone will rarely control a weed problem. Pre-emergents are tools to **reduce** the need for post-emergents. They rarely eliminate the need for post emergents.
The labels of pre emergents have many important instructions and use restrictions. ALWAYS READ THE ENTIRE LABEL. For example, you are limited to 2 applications of each active ingredient per year.
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Prob too cold.
Try cool power or another Ester broadleaf weed control product. Spray when day time temps are in the high 50’s. Use a surfactant. Read the label!!!!!!
Edit: 2 weeks ago may be too soon given temps. Give it another week.
2nd edit: broadleaf for the onion/garlic per my initial comment. You’ll need something else for the grassy weeds in the photo.
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That looks like wild onion to me. I have the same ones in my yard. You have to dig them up or they’ll keep spreading and coming back.
Wild onion. Tri-power. Crush before applying.
Fescue clump. Celsius.