Dastarcus helophoroides (predator)
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Dastarcus helophoroides (predator) (Fairmaire, 1881)
The beetle is a predator/parasitoid of longhorned and brupestid woodborers in eastern Asia, e.g. of Monochamus alternatus. The larvae are ectoparasitoids of the late instars and pupae. While the larval stage lasts only about a week and the pupal stage about a month, the total lifespan of the adult can exceed 3 years.
Releases of the predator in infested trees can significantly increase the parasitation rate and the mortality of woodborer larvae. D. helophoroides females are attracted to holes where frass of the host larvae is expelled. They lay eggs near these holes and the hatching larvae enter the holes, searching for the host larvae. They paralyse these and feed externally on the woodborer larvae.
