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Distribution biology and host specificity of cyrtobagous singularis coleoptera curculionidae for the biological control of salvinia molesta



Distribution biology and host specificity of cyrtobagous singularis coleoptera curculionidae for the biological control of salvinia molesta



Bulletin of Entomological Research 73(1): 85-96



C. singularis Hust. was recorded from Brazil, Paraguay, Uruguay and Argentina in association with 6 spp. of Salvinia (aquatic ferns). Field observations and laboratory studies in Brazil and Australia showed that C. singularis severely damaged S. molesta and that the weevil is suitable as a control agent for this weed in tropical and subtropical areas in Australia. In host-specificity studies using 46 plant species that occur in Australia, development of the immature stages took place only on S. molesta. Minor leaf scarring occurred on sweet potato when in contact with water, but starvation tests excluded this plant as a possible terrestrial host. Adults fed, but were unable to reproduce, on water lettuce (Pistia stratiotes). The high degree of host specificity indicated that establishment of this weevil in Australia is without risk to non-target plants. C. singularis was 1st released and became established in Australia in 1980.

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Accession: 005175867

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