Female mealybugs and scale can only crawl. If you continually have them, that means your current control regime is inadequate, or you are regularly replenishing the population with bugs on new plants brought into your growing area.
They hide in crevices, so you cannot see them. This is why it is recommended to be sure treatments penetrate all the crevices.
Several repeat treatments are needed at 3-5 day intervals every time mealy bugs are found.
Immediate treatment is needed as soon as they are seen.
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