I have a jade plant almost 6 feet tall with a trunk almost 5 inches thick. I've been fighting a mealybug infestation without much luck for over a year now. First I tried to squash them all. Didn't work. Last year I took the plant out on my deck and sprayed it with soapy water. All of the leaves fell off several days later. I thought I had killed it, but new leaves did slowly grow back over the next several months . . . and new mealybugs. Then I tried rubbling alcohol on a q-tip. Didn't work. I sprayed almost the whole plant with rubbing alcohol and this, too, failed. The plant's just too big for squashing or q-tipping with alcohol. I can't find all of the mealybugs and they just come back again. I can't take the plant to a nursery because it's so big and heavy I can't pick it up or get it down the flight of stairs, let alone get it in my car. Is there anything I can do to beat this infestation without killing the plant I've had for 25 years? Is there a systemic I can use? Is there something I can spray it with? Is there another answer?