Lacebug becomes a problem when certain varieties of rhododendrons are placed in too much sun. This keep natural predators of lacebugs from controlling them since the predators (spiders usually) don't like sun and the lacebugs don't mind it. So if you like the plants otherwise, just put them were there is more shade and they will be much happier and no spraying will be necessary. Some recommendations to replace Unique: Belle Heller - 5', -10F. Here is hardiness, sun tolerance, lush foliage, and a lovely flower all in one. The large flower is pure white with a striking gold blotch, set in large, ball shaped trusses on a vigorous grower. Boule de Neige - 5', -25F. Bright green, leathery leaves on a medium sized, rounded rhododendron. It's known for its heat and sun tolerance and is extremely cold hardy. Flowers are snow white in ball shaped trusses. It even blooms well in deep shade. Chionoides - 4', -10F. Tolerant of the sun and cold, this compact hybrid grows beautifully even when planted in locations often considered too exposed for a rhododendron. A broad, dense cushion measuring 5-6' high develops as the plant matures. White, dome trusses are bright and numerous. Disca - 5', -15F. The fragrant frilled flowers open a pale pink that fades to white. 'Disca' is also a late bloomer (June). Tests as resistant to root rot and is sun and heat tolerant.

This can result when newly emerging leaves are subjected to below freezing temperatures. These particular leaves will always look odd, but the rest should be normal if low temperatures were the cause. Distorted leaves can also indicate excessive fertilizer in the planting mix. This, too, should not effect new leaves once the plat is out of the pot and in the ground.

A couple of things are going on. Photo #2 is showing rhododendron leaf spot, Septoria azaleae. Photo #3 & 5 show lacebug damage, not aphids. IME, aphids seldom bother any broadleaved evergreen. Don't really see any yellow foliage. New growth typically comes in a much lighter green, almost chartreuse, but will darken as they mature.

There are various fungal organisms that can produce leaf spotting as shown....septoria, phyllosticta, cercospora. They are often associated with sunscald or winter damage and are typically encouraged by wet weather. I'd guess this to be septoria, as yellowing and foliage drop, especially of the lower, older foliage, is common with this. Take samples into your local extension office for recommended treatment options for your area.