Howdy Midnightfarmer, If the relative humidity is not too high, the foliar application of the Azamax should not be a problem. I have use it (for other critters) as a spray and poured it directly into my reservoirs so the plants take it up and it becomes systemic (nails the little buggers when they munch on the plant!). Just be sure to keep the air circulating, set the sprayer to as fine a mist as it can produce, and cover the top and bottoms of the leaves. When I had some Thrips, I sprayed twice a day and mad sure that the last application was, at least, two hours before the lights were to turn off. Also, as stated on the bottle, mix up only enough spray that You plan to use in one day, I guess that it looses potency after 24 hours.
Good luck