Okay, I ordered http://www.domyownpestcontrol.com/monterey-horticultural-oil-gallon-p-2837.html for the oil and http://www.domyownpestcontrol.com/merit-insecticide-granules-p-301.html for the imidacloprid.
Is there a specific time I should apply the oil in the winter? And would it be best to...
Okay, thanks for the information. So I need to look into some type of oil spray in the winter and spring? This tree has unfortunately been like this for probably 2-3 years.
Any idea what disease is causing this?
The bark is black and streaked, and there are cankers on the limbs. Often times there would be a ton of wasps around in the summer as well.
Once identified, what would be the best course of action to clear and prevent further damage?