Hawaiian Ecosystems at Risk project (HEAR) Ageratina riparia as a biocontrol target in Hawaii

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Information and references regarding Ageratina riparia as a biocontrol target in Hawaii are provided here. For further information, contact webmaster@hear.org.

Biocontrol agent: Entyloma sp.
Status in Hawaii: Entyloma sp. (previously called Cercosporella sp. by some sources) was collected in Jamaica in 1974 and released on the Big Island of Hawaii in 1975 to control Ageratina riparia (the so-called "Hamakua pamakani"). By 1976 this pathogenic foliar fungus had become widely distributed, and has been highly effective in reducing or eliminating Ageratina riparia populations in elevations between 2000 to 3500 feet on the Big Island. In wetter areas, Ageratina riparia resprouted, but seedlings were subsequently shaded out.

Biocontrol agent: Oidaematophorus beneficus
Status in Hawaii: Oidaematophorus beneficus, a plume moth, was brought from Mexico and released in 1973 on a Kona ranch for control of Ageratina riparia (the so-called "Hamakua pamakani"). The moth was later released in Volcano and other areas of the Big Island. By 1975 the moth was well established, and--along with other biocontrol organisms--had significantly reduced Ageratina riparia infestations on the Big Island.

Biocontrol agent: Procecidochares alani
Status in Hawaii: Procecidochares alani, a stem-galling fly, was collected at 2000 foot elevation in Mexico in 1973 as a potential biocontrol of Ageratina riparia (the so-called "Hamakua pamakani"). It was released in Kona in 1974 at the 3400 foot elevation, and later at other locations on Hawaii's Big Island. By 1975, populations of the fly had built up, and--along with other biocontrol agents--had effectively decreased Ageratina riparia stands in many areas of Hawaii Island.

The Hawaiian Ecosystems at Risk (HEAR) project is currently funded by the Pacific Basin Information Node (PBIN) of the National Biological Information Infrastructure (NBII) through PIERC (USGS) with support from HCSU (UH Hilo). More details are available online. Pacific Basin Information Node (PBIN)National Biological Information Infrastructure (NBII)

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