Help- what is wrong with my plants?? (disease, nutrient deficiency, etc?)

All of my hydrangeashave developed the same issue. It began with some yellow spots on existing leaves and now has progressed to where new leaves coming in are discolored, deformed and almost white in some places. My azelas now have small yellow spots on the leaves as well. Just took some pics - Any idea what this is? (Google has not helped, I can't find anything that looks exactly like it)

Any chance anyone sprayed anything, dusted anything - even near by? It's odd that you have two different plants have the same 'damage'. Do you have your lawn treated? What do the undersides of the leaves look like?

Hi- it's more than just the two plants, I have about 8 or 9 hydrangeas and 3 azaleas total, it's happening everywhere! And nothing sprayed that I know of. That's why I am particulary worried about it being some kind of disease that is infecting everything...

Bottom of the leaves look pretty much fine actually - other than the color loss showing through there as well when it is really bad on specific leaves. It almost looks like a vitiligo in general on all the plants...

It reminds me when we had mealy bugs. But, I think we may have more than just mealy bugs. We sprayed for bugs. It finally cleared up.

Google "iron chlorosis" and see if that makes sense. To verify, get a soil test.

Thank you!

Doesn't look like chlorosis to me.

Given the humidity lately it could be a fungus, like powdery mildew or azalea rust. It looks like only the new foliage is affected, which is also an indicator of fungus.

Not sure if this would have anything to do with your widespread problem but if you water your plants with a hose, only water the soil around the plants, not the leaves/foliage.

I'd take a couple of leaves from a few plants (each in separate baggies) to a local nursery or to Ron Carter, and check with them.

To me, could be a combination of scorching by watering on the leaves ( instead of at the roots, as per above, and don't water in the heat of the day), possibly a nutritional imbalance, and a teeny pest infestation.

I've got teeny teeny spider-mites that start off invisibly but that kind of a signature as they bore their way through the stems of fleshy leaves; thrive in humid summers. (Remember, I'm somewhere else)

Azaleas and Hydrangeas are acid-loving plants. They so best in semi shade, with the soil around the roots covered with oak leave. If the soil has been raked bare, that could be part of the problem.