42+ Brown Spots On My Mint Leaves. Found some brown spots on the old mint leaves on my new planted cuttings. Could this be mint rust or just an overwatering problem?
I also have two young banana plants, maybe a foot or so tall, and they have brown spots on their leaves too: Leaf blight affects mint plants already in a weakened state, usually from mint rust. Found some brown spots on the old mint leaves on my new planted cuttings.
The lower leaves turned brown and droopy, and then died and there are brown spots as you can see on the bigger leaves.
There are a couple types of fungi that cause those big brown or black spots on maple trees. There is no direct cure for bacterial leaf spot, but damage can be minimized by. Hi marlene, brown spots are signs of bacterial infection from the overgrowth of microbia that naturally exist in the soil. It is best to contain it somehow, either by planting in containers or raised beds.