Well, first of all, they come from Hell. No really...they generally come in as hitchhikers on other plants and can go for a very long time unnoticed until conditions are right for their population to explode. I have tried spraying rubbing alcohol and insecticidal soap to control them. They work to some extent. You just have to stay on top of the game and spray at regular intervals. That being said, my plant didn't make it. Once the population is large enough, it is often better to toss the plant considering the amount of money and effort one might spend to eradicate them. My problem was confined to one relatively inexpensive plant . A better approach would be to keep up humidity and avoid excessively high temps. Spot check susceptible plants and treat before they go crazy.
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