Maybe downy mildew on my peppers?
I have one very infected sweet pepper, but mostly my hot pepper varieties are struggling to fruit and grow. I have noticed spots and deteriorating foliage on them. At first I suspected they were not getting enough nutrients I side dressed some bone meal. Then I noticed my seedlings were being affected as well. I suspected with this hot weather my green house was getting and staying to humid. Now I am suspecting downy mildew. I am not entirely sure though. I normally grow in Maine and even though we do have downy and powdery mildew I have never personally encountered it. The varieties I am noticing it on are Cornito Giallo F1 OG, Hot Baron, Jedi.
The symptoms in the photos are consistent with phytotoxicity- leaf burn due to one or more environmental and cultural factors. These can include excessive salt accumulation around roots due to overfertilization, foliar fertilizer applications, temperature extremes, excessive bright sunlight or reflected light/heat, etc. Plants growing for long periods of time in small cells, under rapidly changing temperature, light, and water conditions are especially susceptible to these stressors.
Pepper is slow-growing, which makes it more difficult for the plants to rebound. We recommend you plant the transplants out asap or re-plant in larger containers. jt