Basil is low-maintenance,
but even the toughest houseplants can be attacked by annoying critters — they are a literal nightmare for every plant lover and gardener.
Yellow leaves that eventually turn brown will be the first sign that your basil has downy mildew. Your basil wilting, drooping, and producing fuzzy growth on the undersides of its leaves.
The plant stops growing and begins to wilt once it reaches a height of around 12 inches. Woody basil stems, yellow leaves, and possible leaf drop are other signs of this disease.
There is no treatment for downy mildew and fusarium wilt.
Focus on restoring the soil because the fungi that cause these diseases last a long time in the soil.
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.