Spider Mite Treatment
After spraying soil around plant and the plant itself I placed a bag over them to isolate problem. How long can I leave badg on and when to reapply
Certified GKH Gardening Expert
Don't leave a bag on them. They will suffocate. Just spray, and cut away any growth with webbing, since there is no saving it. At that point, it becomes a cocoon that is protecting eggs from spray, so make sure to cut heavily infected growth out.
When to reapply will depend on what you used. Different treatments have different recommendations, so you will want to follow all packaging instructions. This article will help you to combat spider mites: https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm