I had spider mites on my JD's Special C-Tex already this year. Out of 48 plants I am not sure why they chose that plant exclusively? I used Captain Jacks Dead Bug brew by Bonide
http://www.bonide.com/products/produ...ategory_id=250 and it cleaned them off of the plant. It has Spinosad in it and it didn't hurt the plant. I was very impressed with the results! Good luck!
Mark