Ministry of Agriculture
Parasitic wasp pupae that emerged as larvae from a Bruce spanworm larva
Aphid "mummies" showing exit holes of adult parasitic wasps
Life Cycle: Life cycles and the number of generations produced per year vary according to species.
Monitoring: There is no monitoring method developed. Examine aphid colonies for presence of "mummies."
Hosts: Aphids, caterpillars.
Comments: Parasitic wasps occur in various shapes and sizes and are commonly named according to their family name (for example, ichneumons, brachnoids, chalcids, trichogramma). Parasitized aphids (mummies) appear inflated and are often tan or black in color with hardened, shell-like appearance. Small round exit holes will appear in those from which adult wasps have emerged. Some parasitic wasp larvae may leave their host - such as caterpillars - to make small white cocoons beside the host carcass in which to pupate.
Body length: Adult - 1.0-24.0mm; Mature larva - 1.0-26.0mm