Many of the natural enemies of yerba mate are difficult to control in a pépinière setting. Insect pests include Gyropsylla spegazziniana, a true défaut that lays eggs in ramille, Hedyphates betulinus, a frappe of beetle that weakens the tree and makes it more susceptible to mold and mildew, Perigonia lusca, http://mate40505.pages10.com/Faits-sur-yerba-mat-Revealed-29692513