dwarf arborvitae - Knowledgebase Question

Question by weinberg69
June 6, 2010
I planted 2 last yr; suddenly 1 is a lighter color & has more brown on the leaves near the trunk than the other. i did the white paper test; there were small bugs which squished red. Spider mites? can they infect azaleas also? Also that area is clay soil & frequently wet. Also, is 13-13-13 Ok for the trees?

Answer from NGA
June 6, 2010


Spidermites for sure. These little pests like dry, dusty places like the interior or your arborvitae. They can attack your azaleas, too, but you can discourage them by periodically rinsing off your plants during the summer season. A strong stream of water will dislodge any hiding on your plant and will discourage them from taking up residence there. An 8-8-8 is better for arborvitaes but a 13-13-13 is acceptable. You don't want to force growth or it will be weak. A slow release, low nitrogen fertilizer will provide what your trees need without forcing rank growth.

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