What Causes Brown Spots on Basil? If the plant continues to grow at the same rate, I doubt soil pH is the issue, though.

Symptoms of bacterial leaf spot are black or brown spots that appear on the leaves and streaking on the stems of the plant. Over- and under-application of nitrogen is the most common culprit for brown spots on basil leaves. There’s a fungus in the soil that is called fusarium oxysporum. This basil disease is caused by a bacteria called Pseudomonas cichorii.

Bacterial leaf spot occurs when infected soil is splashed onto the leaves of the basil plant. Little spots that make the leaf transparent on Basil. Symptoms of infection first show... Downy Mildew. Bacterial Leaf Spot or Basil Shoot Blight. Ask Question Asked 1 year, 10 months ago. You can prevent the imbalance by using good, well-made, organic compost in … Round Brown Spots on Basil Leaves Bacterial Leaf Spot. Bacterial leaf spot is caused by the fungus Pseudomonas cichorii. ... which sometimes look similar to your basil plant's leaves. Fusarium Oxysporum. Adding phosphorus is said to increase the availability of manganese. first appear as yellowing that is concentrated around the middle... Fungal Leaf Spot… This fungus is spread through... Fungal Leaf Spot. This fungus attacks only the... Downy Mildew. Fungal leaf spots are caused by another fungus called colletotrichum. Signs of downy mildew (Peronospora sp.) Active 1 year, 5 months ago.