Ficus with major Mealy Bug infestation
My friend has a large hibiscus tree with a major mealy bug infestation. They are on the top and underside of every leaf and branch on the tree. She has been spraying with horticulture oils, soap and water and diluted alcohol. She finds plenty of dead bugs on the floor afterwards, but they still seem to be reproducing like crazy.
Is there anything else she can do to erradicate the bugs, or does it sound like the problem is too severe and she should get rid of it to save her other plants? I was thinking that, for a last ditch effort, she can spray a mixture of 50/50 veggie oil and rubbing alcohol and see what happens. I've read in a few places that windex with ammonia works, but she's scared to try this.
What do you think she should do?