Hi, you might need to seek local advice. The distorted leaves in #1256 look like the aftermath of powdery mildew, but I'd expect that disease to be rare or unknown in your climate. The cupping and burnt edges in #1257 don't look at all like PM. Have you been spraying with anything?

Hi Michael, thanks for your input. I did not spray anything on the leaves. Our diagnosis would be thrips attack but I'm still skeptical about it because sometimes it still occurs after spraying pesticides. Or was it caused by overheating from the sun? What's your local advice?

If your area has chilli thrips, that could be the cause. They don't occur in my climate. Florida growers use the insecticide spinosad (that product name is an international generic name). Regular spraying is necessary. Chili thrips should be visible under a magnifying lens if they are present.

Heat stress is also a possibility for the cupped leaves with burnt edges.