What does brown spots and yellowing leaves mean? The plant might have leaf spot disease. If your plant's leaves have small brown spots trimmed in yellow, this could be a sign that it has leaf spot disease, which is a fungus or bacteria that feeds on the leaves. If this is the case, don't start planning a plant funeral just yet. The problem is treatable.
Why are my plant leaves turning yellow with black spots?
Diplocarpon rosae, or black spot fungus, isn't just a disease of roses. It can attack any plant with fleshy leaves and stems if the conditions are right. As the fungus develops, those black spots on leaves are ringed with yellow. Soon the entire leaf turns yellow and falls.
What causes brown spots on leaves of houseplants?
Underwatering, overwatering and lack of humidity can cause dry brown spots, especially along the edges of leaves or on leaf tips. Solution: Stick a finger in the soil. If it feels bone dry, you're probably underwatering. If it feels soggy, you're likely overwatering.