I have 2 Persian Lilac trees growing in large pots. I was hoping you could give me some advice based on the pictures I am attaching. As you can see, on one of the trees, the leaves are in pretty bad shape. When new foilege grows, it only stays green for a short period of time before turning brown like the existing leaves. The second tree was really thriving, but now it, too, is starting to turn brown. I was hoping you might be able to diagnose this for me. Does this appear to be some kind of fungus or is it perhaps a insect causing this (though I am not seeing any)? And based on your diagnosis, what product would you suggest as a remedy? As you can also see from the pictures, the Azaleas growing under the lilac tree are also in bad shape. I have to think, from the proximity, that whatever is causing one is likely causing the other. Thanks, in advance, for any advice you can provide.