The warm and sunny days have resulted in premature green-up of bermudagrass. However, you will see injury. So the question is, how much injury will you see if glyphosate is applied now, on a sunny degree day with slightly green bermudagrass? The bottom chart follows green-up at 49 and 57 DAT. Spraying glyphosate on slightly greened-up bermudagrass will delay green-up. More green-up at application equals more delay in green-up.
However, in my research, bermudagrass has not been permanently injured. A delay in green-up similar to the labeled rate of glyphosate in this test, is likely not going to be noticed by golfers, homeowners, or those that utilize sports fields. However, it is recommended that the area be uniformly sprayed instead of spot sprayed.
A uniform delay in green-up is much less noticeable than irregular green-up that results from spot spraying. However, if it is infrequently trafficked and you are convinced that you will not have need to reseed, there are a variety of options available. All of these are root-inhibiting herbicides and they are typically fine to be applied to lawn-height bermudagrass but they are not the safest option for trafficked bermudagrass sports fields.
If you were to suffer massive loss of bermudagrass due to a severe late frost or winter desiccation, these herbicides would prevent you from sprigging or plugging new bermudagrass to repair the areas this summer.
A safer option would be to use Ronstar oxadiazon or Sureguard flumioxazin. These are shoot-inhibiting herbicides that still control crabgrass and goosegrass preemergence but allow you to sprig bermudagrass at any time after spraying the herbicide. A small risk in delayed bermudagrass greenup from Roundup and delayed winterkill recovery from prodiamine is the trade off if Mother Nature turns against you. I would spray at 0. My target rates in the mixture would be 1 fl oz Barricade 4L or equivalent and 0.
If you have more green bermudagrass leaves than I indicated earlier and the area is loaded with annual bluegrass, I would use Sureguard at 12 oz product per acre with nonionic surfactant at 0.
You will see a slight discoloration to the greening bermudagrass but it will shake this off quickly and start growing again after about 2 weeks of slow or sluggish growth. This treatment will kill the annual bluegrass and give you a 2. You can buy 1. Shawn Askew. Is it too late to treat my Bermudagrass with Roundup? Contact: Shawn Askew The greatest fear of applying glyphosate to dormant turf here in Mississippi is determining if the turf is truly dormant or not.
This winter has been a prime example of the fluctuating temperatures we experience and often times our turf never goes completely dormant. At the labeled rates of 16 ounce per acre, or less, it will not kill semi-dormant bermudagrass, but may delay spring greenup. Spraying glyphosate on dormant bermudagrass lawns Filed Under: Turfgrass and Lawn Management. Turf Tips Newsletter.
Therefore, my suggestion to anyone planning to apply glyphosate to their lawn: Read the label completely to be certain it can be applied to the your turf species Carefully examine the turf for stage of dormancy Determine if you can accept the possibility of delay in spring greenup Assess other weed control options as well.
Published January 15, Dr.
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