Guava root-knot nematode surveys
Not all of the worms in your garden are helpful. Some microscopic nematode worms can be problematic, causing plants to look wilted, stunted, and unhappy.
The NT Department of Agriculture and Fisheries (DAF) is part of a national Hort Innovation research project, “Guava root-knot nematode identification and management”, which is a strategic levy investment of the Vegetable Fund.
DAF are working in collaboration with AUSVEG and interstate governments to identify where some of the problematic, nematode worms, called root-knot nematodes, are found across the NT and which species we have in each region. This is important as the way we manage the nematodes will vary with each species.
DAF’s nematologist Dr Melanie Ford will be visiting the Katherine Region from 27-29 January 2026 to assess plants and determine which types of root-knot nematodes are causing problems in the region.
Melanie will work with local growers and gardeners to collect samples and producers can also supply samples to the Plant Pathology team through DAF’s regional research stations.
If you’re growing vegetables and melons, and the plants look unhealthy, it’s worthwhile to check the roots to see if they look lumpy. If so, you may want to send them in to the laboratory for testing.
Root-knot nematodes do not move very far on their own. Humans play a big role in their spread via machinery, tools, footwear, and plant products. They cause severe galling or knotting of a plant’s root system and can cause stunted growth, wilting and the yellowing of leaves.
If you think your plants may have root-knot nematodes contact the Plant Pathology team at plant.pathology@nt.gov.au or phone 08 8999 2218
For more information visit go to nt.gov.au/grkn
