I wrote a brief note about basil blight last year, secure in the knowledge that it had not spread to Virginia.
But is has. To my house.
Basil blight is a fungal disease that will kill your basil plants and spread to other basil plants through fungal spores released into the air. I like to sow basil seeds several times a season to keep a good supply of fresh, young leaves on hand. I ran out of seed and recently purchased new seed from a large, commercial seed house. The plants looked great at first, then more and more sickly: pasty yellow and brown leaves.
I wondered if it could be blight. When I turned over the leaves, this is what I saw:
See the gray patches on the backs of the leaves? This is the grayish fungus called basil blight. The remedy? Bag up and throw out the plants, soil and pots. I feel lucky I don't have this in the garden (I hope I caught it early enough before it spread).
If your basil gets puny looking, checks carefully for a gray, sooty fungal growth on the backs of the leaves and toss it out ASAP! I wrote to the seed house, we'll see what response I get,
Happy gardening! May your basil stay healthy!