Chitalpa tree – Mildew
Q: I have a chitalpa tree (cross between a catalpa and chilopsis) that has been in the ground about 2 1/2 years.
About mid-summer each year, after it has bloomed it has a bad leaf drop. They turn a rather pale color and fall. They are not brown or dead looking.
I did notice the beginning of what appeared to be mildew last year and I sprayed a couple of times with a fungicide, but that didn’t seem to help. Any thoughts?
A: Where did you get your tree? It isn’t common in the Southeast.
Chitalpa is known to be susceptible to powdery mildew – – and since the mildew infects leaves in spring, rather than later, when you notice the leaf drop, you should spray regularly with Immunox beginning in April.