Provided are wellbore treatment fluids and methods to introduce these treatment fluids in a subterranean formation. The treatment fluids include a diverter material and an aqueous carrier fluid. Further, the diverter material comprises a composite material of a polyvinyl alcohol and a plasticizer. The diverter material includes particles having a particle size distribution of about 2 to about 10 U.S. mesh and an aspect ratio of 20:1 or less. The treatment fluid is introduced into a permeable zone of a subterranean formation, wherein the permeable zone is part of a wellbore that is permeated or penetrated by fractures and fissures. The diverter material diverts at least partially the treatment fluid to a different portion of the subterranean formation.