Malathion is a topical killer only, so you would need to make sure you have it come in contact with all of the bugs, and it only works on adults.
I have had the best effect when combining a systemic insecticide - Orthene or Merit - combined with an insect growth regulator like Enstar. Even then, the key is to be thorough and repeat the treatments regularly. I find that three, weekly applications usually works, but I have occasionally done them more frequently, still spanning that same three weeks.
Ray Barkalow
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