Have you let this azalea dry out to the point that the leaves are all droopy?
They don't that's why I was asking. It doesn't look fungal to me. It looks like they got burned.I have not. I don't let it dry out. I thought they don't like that...?
If that is the only symptom, it is almost certainly not fungal. All of the fungal infestations [other than powdery mildew] have accompanying symptoms on trunk or branches, and involve structural changes in the leaves, such as wilting, thickening, etc. Assuming you have good drainage and are watering consistently, I would say it's sunburn from the look of the photos. Frost damage can look like that, but that's unlikely given where you're located.
If Leo's watching, he may have a more definitive opinion.
They don't that's why I was asking. It doesn't look fungal to me. It looks like they got burned.
When there's root rot the leaves will all look dry and all will be drooping. Do a google search and you will understand what I mean.
It looks like they got burned. Is in it full sun? Partial sun?
Hard to say if the leaves are going through their normal life cycle. What gets me is that I see even new growth with dead tips. Did you spray anything on them?
You didn't spray, it didn't dry out, it didn't get burned, it doesn't look fungal, it doesn't look like it's been attack by mites or leafminers......I would say the soil is staying to wet. Try watering less often.
At this point you can cut the leaves to remove the brown spots but risk the plant catching something with all the cut leaves or just remove them. You'll have plenty of leaves next season.
Azaleas like their roots moist not wet.
Looks like it dried out once.
Don’t let it dry out again. They don’t want to be soggy, but the roots are so fine, they can’t handle drying out at all. Good soil and good watering habits are an absolute must for keeping azaleas happy. My Satsuki are in Kanuma soil, AM sun, then mostly shade after about 10:00. They get watered 1-2 times per day and misted in the afternoons when they don’t need to be watered. 100% Kanuma soil provides them even moisture and makes the margin of error for watering a bit wider.Assuming that did happen, what do you suggest I should do now to remediate that?
Phytophthora can also appear as a drying out of leaves. The new growth in pics show some leaves with a chlorotic look to them. From your comment it is in bad soil, does that mean nursery soil still? If so it will be holding more water than you have in the others. I would pull it from the pot and look at the roots. The older leaves slightly resemble a phytophthora look to them. With the humidity we've been having in Atlanta this likely as I have been seeing it in new plants at my job. It doesn't hurt to treat azaleas preventatively for pythium and phytophthora during our summers. I use a phosphoric acid based product called Rysyst. You can find the same active ingredient in a product called agri-phos.