Spider mite webs don't spread 4 feet. Do you mean webs are spreading from one point to another 4 feet away? That would be spiders, which are good to have in the greenhouse.
Spider mite damage could cover 4 feet of plants on a bench, but the webs are worse on the undersurface of the leaves. Your greenhouse is humid enough you are worried about fungus issues. Be sure you really have spider mites before you start spraying highly toxic chemicals.
You can't ever get rid of spider mites. They live in the garden around your greenhouse. Control is needed. Once the population is knocked way down, use a vigorous spray of water under all your leaves once a week when you water. They can't crawl back onto the plants.
I don't know how many plants you have. I would mix up soap solution and spray the whole collection.
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