Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Predators and parasitoids of Megachile rotundata (F.) (Hymenoptera: Megachilidae), in South Australia.

Abstract

At sites in South Australia, the eulophid wasp Melittobia australica parasitized 19% of the estimated viable population (1340 prepupae) of Megachile rotundata cells during the 1988-89 season. The parasite was successfully controlled by cool storage of leafcutting bee prepupae at 2-4°C with the result that no live parasitoids emerged during the following season's incubation. No M. australica were detected in the field during the 1989-90 season. It is suggested that establishment of a feral population of M. rotundata in South Australia would be slowed, but not prevented by predation of nest cells and adults by ants, parasitism of cells by the indigenous wasp M. australica and possible predation of adults by birds.