Joel Burnsed, agricultural and natural resources agent and extension coordinator for the College of Agricultural and Environmental Sciences, spoke with Martha Stewart about things you could do to prevent the spread of leaf spot.
Leaf spot is a plant disease caused by fungi or bacteria that infects plants through cuts or natural openings on their leaves. Though leaf spot is not necessarily a death sentence, it will weaken plants and spread to others if left untreated.
According to Burnsed, leaf spot cannot be “cured.” However, applying fungicides can prevent leaf spot from spreading further. Experts recommend contacting a local professional for advice before applying a treatment.
Leaf spot can be prevented by controlling the moisture on plants. Reduce overhead watering and water at the base only. If this isn’t possible, water your plants early so they have time to dry out.
Proper spacing between plants is also important to assist in moisture reduction. Infected spots should be immediately pruned and disposed of in a sealed bag.
“Sometimes fungicides can be applied as a preventative control to prevent leaf spots from starting,” said Burnsed.
This can be an effective way to ward off leaf spot, though it’s not required as often during dry periods.