Hi... I have a betula pendula youngii that I planted about 5 years ago, which I love. Today I noticed that the leaves are all very sticky and shiny, and even the grass and small plants beneath it are shiny and sticky. Now, I'm not knowledgeable about trees, so maybe it does this every year and I just never noticed, but I kind of doubt that. I've been noticing lately that there's a bit of leaf drop going on, and some yellowing ones... overall it just doesn't look happy. I did see a good few aphids on it... could just aphids be causing this or does it sound like something else? I'll try to take pictures, but let me send this on first.