straight Neem Oil will choke out the plants pores, not a good idea ... trash the mites with AVID : be sure to read the label carefully, you shouldn't use it too close to harvest, either ... the outdoor growers up here have used it for years ...

Quote: " Avid Insecticide
Avid pesticide features a unique chemistry which provides a different mode of action to control mites and certain insects. The active ingredient is derived from a soil microorganism and is chemically unrelated to any other miticide or insecticide. When applied to target insects, it kills both by contact and ingestion. Avid acts against all mobile forms of mites & kills leafminer larvae as they begin to feed and also stop egg-laying in leafminer adults. " ... Unquote ... good luck