Hi! I'm new to gardening. In November I moved into a new house and inherited from the owners a beautiful large jade. When I first saw it in August it looked healthy. After I moved in, in November, I noticed a few mealy bugs and their cottony puffs. I sprayed with an alcohol-water mixture once a week for several weeks. (There were too many infected leaves and stems to remove the puffs individually.) That helped, but there are still a few mealy bugs left. Then it developed dark holes in some leaves. The lower leaves started turning speckled yellow-green, shriveling, and finally, dropping. Some leaves also developed tiny white powdery flecks, not the cottony puffs of the mealy bugs. Any ideas? It was being watered about once a week in the summer. In the fall I started watering once every three weeks. It gets a lot of light since it sits in a corner in a room with huge windows on both sides of it. It's in a dry, hot place near a heating vent, but being near windows it may get a bit of a draft. Here is a photo:
