Trying to "balance" nature first than exterminate. I dont see any gnat larvae or anything, so its not nearly that bad. Also all the larvae will get to is the mulch layer. If they penetrate that, theyre zerged. Idk. Just taking it all in before I pull the trigger. Im familiar with mosquito bits, and they do the job quick. Will most likely just do the bits this weekend.
If you have endomichorrizae fungi than literally no need for ectomichorizzae fungi. Endo punctures within the roots much deeper than ectoplasm further strengthening nutrient web between roots.
Try using nematodes my cover crops make it impossible for gnats to fly in and lay eggs under soil. If they do my oribatid mites make quick work of the larvae.