In 1998, canola seedlings were also identified as intolerant, with large yield losses observed due to seedling death. As with peas and chickpeas, adult canola plants are resistant. The disease table distinguishes between resistance and tolerance. Although Potoroo is moderately resistant and tolerant it may not act as an effective break crop, especially after cold and wet seasons such as those experienced in areas of SA in 1998. N.Z. Cape is tolerant but moderately susceptible so although it may show few symptoms, it does not act as a break crop.
Stem nematode spreads in hay, faba bean seed, farm machinery, wind and in run-off water.
Caution should be exercised when purchasing faba beans, oat seed and straw of susceptible oat varieties and, if necessary, these should be tested for the presence of stem nematode. This fact sheet supplements other information available, including the wheat, barley and oat variety sowing guides, and the cereal seed treatment fact sheet. These books are written specifically to aid farmers in the identification and control of diseases in their crops. A diagnostic service is available to farmers and industry for diseased plant specimens. Samples of all leaf and aerial plant parts should be kept free of moisture and wrapped in paper not a plastic bag.