14/11/2022
Alien crop circles in your lawn?
They are not caused by UFOs, but by a soil-borne fungus. Normally the fungus would be busy breaking down non-living organic matter in the soil such as old leaves, roots, pet waste, dust, pollen, etc. However, during perfect conditions – cool, fertile, damp still nights – the fungi will attack the living leaves of St Augustine grass leaves.
Brown Patch begins as a fist-sized yellow spot in the lawn and grows outward to form circles or lobed circles when spots join. Brown Patch can grow 20’ in diameter or more. Active Brown Patch will have a distinctive yellow ring around the outer edge of the circle. Inactive Brown Patch will not have the yellow ring. Since Brown Patch is only active during perfect conditions during the night, most Brown Patch is inactive when discovered.
The good news is Brown Patch only impacts the leaves, not the stems and roots allowing the St Augustine plant to fully recover. Recovering can take 7 – 10 days under most conditions. Rarely does Brown Patch destroy a lawn – it will make it ugly, but not kill.
The best action plan is prevention. Brown Patch is most active in St Augustine lawns that have high nitrogen levels and low potassium levels. Using minimum amounts of nitrogen fertilizers and high amounts of potassium will reduce Brown Patch. Applying nitrogen to Brown Patch will only make it worse – never apply nitrogen to a St Augustine Lawn with active Brown Patch.
Learn more here:
Those brown circles in your lawn that look like alien crop circles are caused by a soil-borne fungus that when conditions are perfect will attack the leaves of your St Augustine lawn. The common name for the disease is Brown Patch. Brown Patch is a cool weather fungal disease that can cause cosmetic...