No PhD here, lol, but I can tell you that I tried using DE and it didn't work for me, so now I use fenbendazole, praziquantil and ivermectin as suggested by vets, published studies and books like Plumb's Veterinary Drug Handbook, Clinical Avian Medicine and Veterinary Parasitology Reference Manual. Of course all birds are weighed and then dosed in mg/kg, no exceptions.
-Kathy
-Kathy