I was surprise this year. I really have hard time to grow thai basil this year, I tried both germinate from seed (which works last 3-4 years) and move to small pot or even getting the small plant from bigbox store. They all pretty much looks like this in the photo. (leaf spot / gray out, wilt stem the fall down)
I start to suspect this is some kind of disease. Can you tell me what’s the problem and how to solve it?
I do not know what zone you are. But basil like hot weather. We have a cooler spring. It could be just cold damage. No systemic diseases. Haul the pot indoor at night and the plants will recover.
Yeah temps should be above 50F if lower, you could kill it. My basil is still inside the house.
I have (and still do) use Actinovate spray on regular basil. It does a good job of eliminating those brown areas on the leaves. I would think it should work on Thai Basil too.
I have never had the problem, currently I only grow African Blue Basil, as it does not ever die, well unless I kill it!