42+ Dark Spots On Basil Leaves. I just bought a basil plant this past week at the supermarket to have some fresh basil for cooking. If the spots are from a fungal infection, there are several culprits to choose from.
Bacterial leaf spot best identified by black spots or lesions on the leaves of basil, peppers, tomatoes and other plants, bacterial leaf spots thrive in wet, humid conditions and spread through splashing water such as rainfall.
Basil can suffer from a wide variety of afflictions during the growing season. Photo by laura taylor/courtesy flickr. White spots on the leaf may be benign, or may signal a cultural problem. If the disease continues, i'll consider a treatment such as a fungicide.