What happened to my beautiful Azalea japonica? I bought it in full bloom about two weeks ago (here in Central Europe), repotted it after a few days (which was perhaps a mistake), initially placed it in a sunny spot (perhaps another mistake) and watered it daily and a quite a lot (with regular water).
Now within the last few days all of its blooms have collapsed, many have fallen off, and there is a a white substance on many leafs. So I guess the azalea has caught some disease (even though its natural blooming season is also coming to an end.)
What is this and how can I treat it? Will this be contagious to my other plants? And what are some general best-practice rules for handling azaleae?
UPDATE Here is another photo. The terracotta pot is approx. 30 cm in upper diameter. The original one was approx. 26 cm in diameter and made of plastic. I've also run a quite test with a simple (Seramis) moisture indicator and it currently says "dry".