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Tuesday, 09 June 2026 13:25

Earthworm eDNA Testing Offers New Insights into Vineyard Soil Health

Written by  Sophie Preece
Hannah Ansley, left, and Vanessa Burrows at Hill Labs Hannah Ansley, left, and Vanessa Burrows at Hill Labs

Many winegrowers around the country will be preparing for seasonal nematode assessments this winter, including those that use eDNA to catch their "worm-count".

Hill Labs Blenheim Site Manager Vanessa Burrows says traditional methods for the count are labour-intensive, requiring growers to take a spade-square of soil to the depth of the spade, then break it up and manually count the earthworm population.

Supporting Sustainable Vineyard Management

The Earthworm eDNA test instead uses molecular technology to identify the presence of A. calignosa - New Zealand's most prominent earthworm species - and "contributes to building a holistic understanding of soil health", Vanessa says.

"Winegrowers have been particularly interested in this test, using it as another tool in the toolbox to understand their soil health."

eDNA testing can complement or enhance traditional monitoring methods, she adds.

"Earthworms are a crucial component of soil biology... and abundant earthworm populations are widely recognised as an indicator of healthy soil."

Hill Labs Showcases Soil Testing Innovation at WinePro

The eDNA is one of the services "from vine to vintage", that Hills Labs will be showcasing at WinePro, with opportunity to explain the science, build trust, and gather direct feedback from the industry on how the services are performing, "including any needs for new testing or changes to food limits and standards".

New products and technologies, such as eDNA testing, can be easier to understand when customers can discuss real-world applications in person, Vanessa says.

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Jonno Hill was seven years old when his parents Dr Roger and Anne Hill established Hill Labs in 1984.

Groundbreaking test paves the way

Hamilton-based Hill Labs has introduced a new test to detect earthworm eDNA levels in soils, claiming that it marks a significant development in soil health assessment.