This is the bane of my garden and plants! Bermuda grass!! I call it devil weed.
I've been searching for about 2 years to find a remedy.
By accident I just found it, while looking for something else.
There was a research paper (Researchgate) on the success of using mulberry leaf
water extract, a 75% solution KILLS Bermuda Grass!!!
Who would have known, and I have loads of mulberry
trees!
Here is the link to the article:
https://www.researchgate.net/publication/230020222_Mulberry_leaf_water_extract_inhibits_bermudagrass_and_promotes_wheat_growth
scroll down the paper and you will find how they make it, my short version is:
wash leaves thoroughly and let the leaves dry ( a few days)
soak dried leaves in tap water at 10%(w/v) at room temp (13-25 degrees C) for 24 hours,
filter to obtain a 10% extract
Then boil to concentrate it by 95% - this is now 100% stock solution.
Dilution of stock solution can be made to make 75, 50 or 25%
basically above 25% seems to block the bermuda grass from growing but they seem to recommend 75% or more
75% to 100% mulberry leaf water extract sprayed on the offending devil weed will kill it!
I plan to make cauldron's of the stuff!