Hello all, 12 years ago I purchased a home in Newberg Oregon (about 20 miles west of Portland), and the pride & joy of this home is a very large mature Monkey Puzzle tree in the front yard. About 3 weeks ago (after having been gone for about 10 days) I returned home and noticed that the lower branches and interior branches were unusually brown. So much so that I felt compelled to go to the nursery (I took a branch sample also) and discuss the matter with them. They defined the problem as "spider mites" and suggested the following; 1) Trim out the lower / dead branches (rented a 45 foot lift truck which was about 10 feet short of reaching the top...) - done - 2) Apply a systemic pesticide to the base of the trunk (a product from Bayer) - done - 3) Apply a topical prodcut to kill any of the live "spider mites" (used a product called TalstarOne) - done - 4) Applied nitrogen to the dripline area of the tree & water throughly over the following coupld of weeks - done - My concern is that the tree "appears" to be holding its own, however in the 3&1/2 weeks since I have performed this work there has still been a bit of "browning" that has occured... Hence my concern... What can I do further...??? Thank you very much for your time !