Granular Bayer Systemic--dose??

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Some flower spikes do produce sap drops naturally and it doesn't mean there are bugs. There has been a recent post on here of someone else whose Phal has these at the abscission points (where the bud meets the stem. My cymbidiums do it a lot. Also some cattleyas on the sheaths. Some aphids and whitefly do create a sticky sap, but that is different, so determine what you have first before using chemicals. If it is a nice round clear drop that looks like a water drop, it is likely just normal.

Having said that, if you really do have whitefly, they can be terrible to get rid of, but you would be seeing them quite easily.