The sticker in the spray is a great idea. I bought a small bottle, but have not tried it yet.
Met52 is a fungal spore that is a disease organism for the bugs. It requires a direct hit, but does have the residual effect of the disease being contagious. That contagiousness relies upon a dense population, typical with whiteflies. What happens, I think, is that the flies die down to a low enough density that they don't transmit the spores to each other, then eventually come back. No spray seems to work forever. I have just a cheap 1-gallon pump sprayer.
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