Some more on RLN

Severely affected intolerant cultivar (right) compared with a tolerant cultivar. Populations of the nematode in this field were very high

The last issue of Ground Cover suggested that root lesion nematode numbers could be lowered by careful choice of crops and varieties.

Growing resistant crops limits multiplication of the nematodes and thus reduces losses to following crops.

Intensive GRDC-supported research in South Australia and Victoria has now pinpointed many of those crops and varieties which are resistant to nematode attack.

To benefit from this research, growers need a soil assay to establish which nematode (Pratylenchus neglectus or P. thornei) they have and at what level.

Here are some of the findings:

  • General resistance — faba beans, field peas, triticale and a few wheat and barley varieties have good resistance to both nematode species.
  • P. neglectus — likely to cause damage in lighter, less fertile soils where good host crops such as some wheat varieties and chickpeas have been grown in the rotation.
  • Canola: susceptible
  • Barley: generally less susceptible than wheat. Arapiles, Barque and Chebec have useful resistance; Sloop and Schooner are the most susceptible barleys (although still not as susceptible as most wheat varieties)
  • Oats: moderately resistant
  • Vetch: moderately resistant
  • Medics: moderately resistant but intolerant
  • Wheat: Excalibur, Krichauff and Worrakatta moderately resistant.
  • P. thornei — generally found in clay soils (both nematode species may, however, be found in a range of soil types).
  • Canola: moderately resistant (further work is still required on canola)
  • Barley: Arapiles, Schooner and Sloop are resistant
  • Vetch: Languedoc and Blanchefleur susceptible; Morava moderately susceptible
  • Medics: Paraggio, Sava and Mogul moderately resistant (further work is required)
  • Field peas: resistant
  • Lentils: resistant
  • Faba beans: moderately resistant
  • Wheat: durums are moderately resistant; Excalibur and Krichauff moderately resistant, but Janz, Goroke, Ouyen and Frame proved the most susceptible
  • Sub-clover: Seaton Park, Trikalla and Goroke moderately susceptible.

Program 2.6.3

Contact: (South Australia)

Ms Sharyn Taylor 08 8303 9381 or

Dr Vivien Vanstone 08 8303 7279;

(Victoria) Dr Grant Hollaway

03 5362 2111