Tetrastichus is a genus of hymenopteran insects of the family Eulophidae.
Tetrastichus planipennisi is a parasitoid of the emerald ash borer, a wood boring insect native to Asia which is an invasive species in North America.
Tetrastichus setifer is a paraditoid of the scarlet lily beetle. The beetle is invasive in North America, and highly destructive to lily species; the wasp has been introduced there for biological pest control.
Tetrastichus coeruleus can be used as a biological control agent for the common asparagus beetle.
Host species The genus Tetrastichus parasitizes many different species of Lepidoptera, such as Pyralis farinalis.
References
Key to Nearctic eulophid genera Universal Chalcidoidea Database