What are these yellowish spots under and above the bell pepper plant? And I can see black ants around these spots. Under the leaf of the bell pepper plant

Above the leaf of the bell pepper plant


Those appear to be aphids, although the resolution of the photo leaves them a bit blurry under magnification. That would also explain the ants, since aphids secrete a sugar-like syrup known as honeydew which the ants like. It's probably easiest to remove them by hand, unless you have a lot of infected plants. You could also use insecticidal soap, but make sure that you cover the aphids with it (it's a contact pesticide) and don't apply during a sunny day (late in the day is okay).

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