Although we had the first official day of spring this week, we still aren’t fully done with winter temps just yet. Temperatures are still pretty mild but we will start to see the bermudagrass start to green up and come out of dormancy soon. Right now with most of it still dormant and brown, those green and purple weeds stick out like a sore thumb.
We are getting quite a few calls from customers who have already had their pre-emergent application put down but are wondering why their weeds aren’t dying as fast as they normally do all summer. So how does the cold weather affect the pre and post-emergent application? Pre-emergents need to be watered into the soil where it is activated and stops weeds from germinating throughout the summer.
Any existing winter annual weeds are still fairly small with the cold temperatures. Generally, they are much easier to control when small. In fact, that’s one big reason we treat those the previous fall for our existing customers, so they do not have hardly any weeds now that need to be controlled. New customers however often have alot of weeds, so they need to be treated with post-emergent herbicides. At LawnAmerica, we use two products on bermudagrass and zoysiagrass, Trimec and Atrazine. The Trimec will kill broadleaf weeds, but very slowly when it is this cold. The Atrazine is soil absorbed, so provides us with even better control on broadleaf weeds and grassy weeds such as Poa Annua. Again though, it works very slow during cold weather. As temperatures rise, the weeds will die out faster, but they will also be larger then and harder to control at the same time.
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