If you’re dealing with a mild fungal infection,
try applying fungicides or neem oil to prevent the spread of the disease. Watering at the plant’s base is the most effective strategy to fight against leaf spot.
Wilting, leaf curl, brown stems, and dark leaf edges are all signs of too low temperatures. Too much sun can burn your basil.
Your basil will be at risk if the temperature falls below 50 degrees Fahrenheit.