Posted: 23/11/2012 at 11:12
I have lost two junipers over past couple of years because of phytophthora and the symptoms were much as you describe. But, red spider mite/spruce mite, etc., do damage to juniper, picea causing needle drop but this damage is done in summer when weather is hot n dry. Wind burn too but conifers tend to brown off as they get taller anyway. Is it possible they are too dry, despite all the rain this year?