WPM week 5 flowering

I’m in week 5 of flowering and noticed small patches of WPM on fan and sugar leaves. Fairly spread through the canopy but not too thick yet. Currently using a hand sprayer with an IPM and treating affected areas leaf by leaf until potassium bicarbonate arrives tomorrow. I’ve got a fairly large canopy and it’s a bit tedious to do it this way, I planned on pulling at week 9 and am wondering if I could possibly get away with a foliar still or if there are any other alternatives.