Thanks for the clarification. But with your chemical commitment for SWD control, there is probably no prospect of using ground-based nematodes in your control plans. I don’t know anything about nematodes sensitivity to various insecticides, so I am assuming the worst here.
SWD fly-ins are not a problem for the nematodes, just another food source. When the fly-ins reproduce their developing larvae/pupae are parasitized and this builds the nematode population while reducing the next generation of SWD. After multiple 2-3 week cycles of this reproductive process you will have a much increased nematode load and a much reduced SWD population.
One thing that I am assuming is that raspberries represent an “SWD magnet”, and will be visited and favored for reproductive purposes (because of the timing and accessibility of the fruit). And so early in the season, raspberries will attract SWD from other local SWD domains and sources.
And your location in the Pacific Northwest may open another biocontrol option in the form of the predator wasp Ganaspis brasiliensis, which was featured in the lead article for this discussion. And which has apparently naturalized in some locations. See below