Tiny yellow spots on outdoor flowering leaves (picture)

We're growing outdoors in the southwest and today one of our plants started showing some faint, yellow spots.



The underside of the leaf looks fine, the spots do not go all the way through the leaf. The plant is showing a lot of evidence of insect feeding, we see grasshoppers on it everytime we go out there and many leaves have big bite marks taken out of them. We have trimmed a fair amount of damaged or inconvenient leaves in the last few weeks. The plants are in their fourth week of flowering and get watered a few times a day, from the hose. City water. We are careful to water the earth near the plants and leave the plants dry when they are in the sun. We have not used any store-bought chemicals or plant nutrients.

The spots look similar to a few different things in the stickied threads, does anybody recognize these particular yellow spots?

They remind me of spider mites.

Thanks. When I searched for "tiny yellows spots on leaves" I got a bunch of different things that looked similar to this, but when I searched for "spider mites" I got images that match our leaves exactly. It is spider mites, and the symptoms just started showing today, on one plants out of five. Since they are outdoors in the open, is there anything I can do? Would removing the plant with mites accomplish anything, or will the mites be in that entire area now?