It’s not unusual to see a spot on a leaf. No big deal, right? Maybe.
A single spot on a leaf might be nothing or it can be home to more fungal spores than we can count, or it may also indicate anthracnose. Each of those spores can catch a ride on a breeze or a rain drop to infect nearby leaves and plants. Before you know it, your garden has a fungal problem.
Symptoms of leaf spot
Symptoms can range from insignificant, solitary dots or bumps to entire patches of brown, black, purple, or yellow that cover the majority of a leaf. It is easiest to determine what causes leaf spot by considering the type of plant being infected. Once you identify the cause of leaf spot in your garden, you will be better able to help your plants.
Commercial growers use a fungicide called chlorothalonil (Bravo, Echo, and Daconil) on plants in the nursery to eliminate this pathogen, but the use of resistant cultivars is really the only option available to home growers. Strawberries are also vulnerable to common leaf spot.
Leaf spot controls
Since fungicides are not considered justifiable for most causes of leaf spot, good sanitation and cultural controls are your best bet. This means:
You can grow a surprising amount of food in your own yard. Ask me how!