Anisopteromalus calandrae

Anisopteromalus calandrae (Howard)

Systematic position: Insecta, Holometabola, Hymenopotera, Apocrita, Chalcidoidea, Pteromalidae.

Distribution: Cosmopolitan.

Morphology: Body of adults mostly shiny black, anterior leg segments dark, others brown.

Life history: Anisopteromalus calandrae is an ectoparasitoid that attacks several beetles. Its females are attracted to products infested by pest larvae, locate them and pierce their bodies. The hosts are thus paralyzed and an egg is then placed on their bodies. The hatched parasitoid larva develops within 2-3 weeks on the host’s body fluids, optimally at temperatures around 30°C. Adults provided with honey live for approximately 4 weeks and a female produces about 140 eggs. Adults emerging from Callosobruchus maculatus were significantly larger and heavier than those that had developed on other hosts.

Economic importance: Being polyphagous, A. calandrae can kill large numbers of several stored product pest beetles, thereby greatly reducing the extent of their damage.. Rates of control depend on the container of the commodity and on the beetle host. Parasitism was highest on Rhyzopertha dominica, nil on Oryzaephilus surinamensis. In scattered wheat 76% of Sitophilus oryzae were parasitized, as against only 30.0 and 47.0% of the same pest in small cotton or burlap bags.

Effect of pesticides: Anisopteromalus calandrae has become resistant to organophosphates. Treatments with diatomaceous earth, applied against S. oryzae, were very detrimental to the parasitoid.


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