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Home > Plants, Pests & Pest Control > Pest Management > Emerald Ash Borer Program > EAB Biocontrol > Tetrastichus

Tetrastichus planipennisi Yang (Hymenoptera: Eulophidae)


Tetrastichus planipennisi are small parasitoids (1.6 to 4.1 mm long).  Adult females locate EAB larvae under ash bark and insert eggs into EAB larva.  Parasitized EAB larva remain active for approximately one week although the parasitoids develop within and eventually consume the EAB larvae.  Tetrastichus planipennisi larvae pupate inside the EAB gallery and emerge approximately 15 days after pupation by chewing an exit hole through the bark.  They overwinter as larvae within the host or host gallery.  Approximately 4-172 progeny are produced per EAB larva.  In China, T. planipennisi completes four or more generations per year and parasitism levels range from 0-65%.

Yellow starthistle seedlings
Adult Tetrastichus planipennisi
Yellow starthistle plants
Adult Tetrastichus planipennisi

Yellow starthistle seedhead
Tetrastichus planipennisi larvae
Yellow starthistle infestation (Image credit: Steve Dewey, Utah State University, Bugwood.org)
Tetrastichus planipennisi pupa


MDA Contact

Chris Mallet, EAB Biological Control Coordinator

Jonathan Osthus, Project Manager

Plant Protection Division