For several years I've grown rosemary in an herb bed in NJ/Zone 7. Never any issues until last summer I noticed yellow spots on them. This year, again. How do I get rid of them. I have some insecticidal soap. I was thinking of spraying them and bagging them up over night with plastic bags to kill the thrips. The issue has spread to my Greek oregano too. Is the soil now infested? Should I abandon that bed for a few seasons. Usually have no issues with insects so this is frustrating. Thanks in advance.