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Home NEWS Science News

Invasive beetle species in Hawaii can now be identified faster with new genetic test

Bioengineer by Bioengineer
January 25, 2017
in Science News
Reading Time: 3 mins read
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Annapolis, MD; January 20, 2017–Researchers at the University of Hawaii have developed a new genetic-testing method for identifying the invasive coconut rhinoceros beetle, which promises to be much faster than existing physical identification methods. The new tool, reported in the Journal of Economic Entomology, could be a significant step toward keeping the species–a damaging pest to coconut palm trees that was first seen in Hawaii in 2013–from becoming widespread.

Coconut rhinoceros beetle and a similar species, oriental flower beetle, are nearly indistinguishable until they've grown to their later life stages, which makes early detection difficult. Currently, egg or larvae samples from the field had to be raised in a lab until their third life stage, which could take several weeks, before insect scientists could determine which species they were looking at.

However, a genetic testing method known as a multiplex polymerase chain reaction (PCR) assay, can be used to identify the species with genetic material extracted from samples of the beetles' eggs, larvae, or excrement. Researchers Shizu Watanabe, Ph.D., and Michael J. Melzer, Ph.D., of the Department of Plant and Environmental Protection Sciences, College of Tropical Agriculture and Human Resources, at UH identified genetic markers in the beetles' DNA that can be used for differentiation via the test. Once samples are received in the lab, the PCR assay can be conducted in just a few hours, Melzer says.

The new method will help "ensure that eradication efforts are being directed at coconut rhinoceros beetle and not oriental flower beetle. This assay will help to prevent any misidentification in the field," Melzer says. "Such misidentifications might result in resources targeting oriental flower beetle, or worse, ignoring a coconut rhinoceros breeding site because the specimens discovered were identified as oriental flower beetle."

"For species that require highly technical expertise for identification, molecular assays represent a reasonably straight-forward approach for identification, either as stand-alone assays or in parallel with morphological identification," Watanabe and Melzer write in their article. "For pests of regulatory concern, rapid and accurate insect identification is essential, and molecular assays can address these needs."

###

Read the full research article: "A Multiplex PCR Assay for Differentiating Coconut Rhinoceros Beetle (Coleoptera: Scarabaeidae) From Oriental Flower Beetle (Coleoptera: Scarabaeidae) in Early Life Stages and Excrement," January 23, 2017, Journal of Economic Entomology: https://doi.org/10.1093/jee/tow299

CONTACT: Joe Rominiecki, [email protected], 301-731-4535 x3009

ABOUT: ESA is the largest organization in the world serving the professional and scientific needs of entomologists and people in related disciplines. Founded in 1889, ESA today has over 6,000 members affiliated with educational institutions, health agencies, private industry, and government. The Society stands ready as a scientific and educational resource for all insect-related topics. For more information, visit http://www.entsoc.org.

Journal of Economic Entomology publishes research on the economic significance of insects and is the highest-cited journal in entomology. It includes sections on apiculture and social insects, insecticides, biological control, household and structural insects, crop protection, forest entomology, and more. For more information, visit https://academic.oup.com/jee, or visit https://academic.oup.com/insect-science to view the full portfolio of ESA journals and publications.

Media Contact

Joe Rominiecki
[email protected]
301-731-4535 x3009
@EntsocAmerica

http://www.entsoc.org

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Story Source: Materials provided by Scienmag

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