Hey Wolfie...
Any grub in the ground we basically lump together as "white grub complex"; you can tell them apart if you want to measure them and count the hairs on theitr butts (no, not a wierd colloquillism, prone as I am; the hairs or [url=https://ohioline.osu.edu/hyg-fact/2000/2510.html]raster patterns on the butts of grubs[/url]is the best ID key). But with nematodes it doesn't matter... they like them ALL...
It will come with directions but it's pretty simple. You are treating the soil the grubs live in. The best time of year to treat is pretty quickly; you want to get in the soil as the adult beetles are laying or just after to get best results. Nematodes predate across the whole WGC, and propagater themselves in host bodies, so
only treat where you have issues. Blanket treatments are only nominally effective; they will follow the "plume" from wherever the big hatch happened seeking food, so not to worry about coverage. Order early in the week; a weekend stuck in a post office has killed more nematodes than I care to think about. UV rays are another bigg killer; apply on rainy days or at dusk; watering afterwards is also helpful. I have always used watering cans, both at home and professionally, but find the clay suspensions clog roses, so leave the rose off.
Done correctly nematodes are an excellent curative and preventative; I did my frontlawn dutring a really nasty grub outbreak three years back and still haven't seen enough to warrant treatment. Let's be clear here; I still see grubs if I cut a square foot of turf, but maybe one or two, and no obvious damage. Because of the nature of organic lawn, my roots are going down 12-14 inches at this point (CAN'T do that with chemicals), so if they nibble a bit at the bottom, no big deal...
I hit my flea beetles early this year with both barrels (pyrethrins AND neem in rotation) and haven't seen any in a while, Squash beetle and striped cucumber beetle were coming on, but assasin bugs have showed up and wrecked their fun. Saw more assassin bugs than beetles tonight on the twilight tour

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Picking zukes and summer squash and wax beans
HG