Abstract
SUMMARYIn laboratory tests with Heterodera schachtii, root leachates of nematode‐resistant and susceptible cruciferous crops stimulated egg hatches of up to 77% and 95% respectively. In these tests very little hatch occurred at 5°C or 10°C, more at 15°C and most at 20°C. In field experiments in which these crops were sown in September 1982 and August 1983 into soil infested with H. schachtii, numbers of viable eggs had decreased only slightly under resistant crops 4–5 months later. This was possibly because the soil was too cold and dry to permit a large proportion to hatch.
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