Reading this article and others in the same issue on mealy bugs reminded me of how I try to cope with this universal problem. I thought I'd share some of my thoughts with you on the subject.
Here is the rubbing alcohol mix I prepare in a one-gallon jug (I've never tried sudsy ammonia):
1. 4 pints of 70% (by volume) Isopropyl Rubbing Alcohol.
2. Ivory dishwashing liquid. I'm not very exact on the amount -- around 8 to 12 or so drops.
3. Tabasco Pepper Sauce. Same drops as above.
4. Water from the faucet. Fill the rest of the jug with water.
The Ivory dishwashing liquid is the sticking agent that makes the mix stick to the little mealy bodies -- which hopefully makes them sicker than the devil. I read somewhere many years ago that the Tabasco sauce helps to discourage spider mites. I've used this mix for years and I've never seen any bad effect on any of my plants. Although I don't have any scientific data on the effect of this mix on mealies and spider mites, I believe I've kept the population down some by my constant use of it. I have a number of squirt bottles full of the mix strategically placed near my plants for immediate use when I need it.
Web editor note:
I have tried this mix too. It works great.
But a caution: this is for cactus and succulent plants only.
My broad leaf plants, especially a palm and Ficus benjamina
reacted very badly when hit with some over-spray.