Q.White looking mold splotchy, wet when rubbed on pepper plants and spreading.
When rubbed feels slimy but we have had a long HOT spell of weather [98 days over 90], no rain. Thought it might be dwarf red spider mites, but none observed.
Certified GKH Gardening Expert
It may be powdery mildew, but without seeing it, I can't be sure. Here are two articles that describe typical problems with pepper plants:
https://www.gardeningknowhow.com/edible/vegetables/pepper/common-pepper-plant-problems.htm
https://www.gardeningknowhow.com/edible/vegetables/pepper/pepper-problems.htm
Here's an article on how to treat powdery mildew: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm