Abstract
UNLIKE most other species of Heterodera, the larvae of the cereal root eelworm (Heterodera avenae Wollenweber, 1924) do not hatch in response to diffusates of the host plant root1. The mechanism controlling hatching in this species has never been demonstrated, although it has been known for many years that in the field larvae invade the roots of the host plant in the greatest numbers in spring and early summer2. Experiments carried out at the Welsh Plant Breeding Station during the summer and winter of 1961/62 indicate that, in the laboratory, hatching of the cereal root eelworm occurs in response to a rise in temperature after a period of low temperature.
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