The old Ed's Mix does the trick and no scratching necessary. One pint of rubbing alcohol, 50%-70%. one pint regular 409 in a gallon of water. spray thoroughly. It is a contact killer so does require repeats because it doesn't kill the eggs. It does penetrate under the scales and kill effectively. Three day intervals would do it. I have a moderate greenhouse, 8x20, and this controls all sorts of nasties. tom jennings
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