Host Specificity and Aspects of the Biology of Coelocephalapion aculeatum (Coleoptera: Apionidae), a Potential Biological Control Agent of Mimosa pigra (Mimosaceae)

Abstract

The biology of the weevil Coelocephalapion aculeatum (Fall) and its specificity to Mimosa pigra L. (Mimosaceae), a serious introduced weed in Australia and Thailand, were studied in a quarantine facility in Australia. Ninety-two plant species were screened, and M. pigra was the only host that sustained a population of C. aculeatum. Adults fed on developing and open inflorescences and oviposited mainly in buds of inflorescences of mid-to-late development. Larvae developed and pupated within these buds. Developmental time from egg to adult was 10–12 d. Field releases commenced in July 1991 in Thailand and in January 1992 in the Northern Territory of Australia.