i have found these bugs on several different plants. With the naked eye they always look like a grey band having the same shape .. its not until I have a photo or video and zoom in that can I see the individual bugs. I have searched the internet but cannot find anything that resembles this. One person said they are possibly aphids. I sprayed with Trilogy yesterday, which is good for aphids, but that effort could have been a waste of time. Can someone please help identify these insects?
From the flies around them, the likely guess is they are fly pupae which have stuck themselves on the leaf. Presumably you missed the earlier stage (probably a week ago) when they were little maggot-like grubs feeding on your plants. Flies tend to lay a batch of eggs in one place which all develop at the same pace if conditions are good, hence the relatively huge infestation on one leaf.
They are not going to do any more damage to your plants now. What you can see is just a protective shell with a maggot turning into a fly inside it. The pupae are probably hard to dislodge mechanically (they are literally glued on) and their "shell" won't absorb chemicals, so just go after the flies as they hatch and hope you don't get more batches of eggs.