My Emerald Green arborvitae that I planted this Spring is starting to brown out. The same thing happened to the previous Arb that I replaced because of the same reason. I treated both with a granular disulfoton 2% as suggested for sprider mites. That obviously didn't solve my problem. The pricture is of the older Arb that I replaced. Can someone advise as to what's causing the browning and what I can do to stop and prevent it? Thanks.
You should post this in 'pests and diseases', or maybe 'trees and shrubs'. This forum is for bug files questions - not too many read this one.
You can tell if there are spider mites by shaking a branch over a piece of white paper, and what looks like specks of dust will show up, but they move. I don't know about disulfoton, but spraying the foliage with water frequently will drown the spider mites, if that's what's going on. It's been working on my Alberta spruces so far
