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Diapause in Globodera Rostochiensis and Variability in Hatching Trials

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image of Nematologica
For more content, see Nematology.

Hatching of G. rostochiensis Ro1 in picrolonic acid, distilled water and potato root diffusate was studied simultaneously at two laboratories. Although conditions of culture and storage of the nematodes, production of the diffusate and methods of hatching were standardised, there were differences in the proportion of viable eggs that hatched. These were probably due to discrepancies in the assessment of viability of unhatched eggs, compounded by differences in efficacy of the diffusates produced in the two laboratories. Hatch tended to be slow and prolonged in tests in autumn and early winter and rapid in spring and summer. Hatching curves differed for cysts from the same population reared at the two locations. Diapause was therefore demonstrated unequivocally in this population of G. rostochiensis. It must have been caused by environmental conditions during development of the females on potato roots.

Affiliations: 1: Department of Pure & Applied Biology, Imperial College at Silwood Park, Ashurst Lodge, Ascot, Berks, England SL5 7DE; 2: Scottish Crop Research Institute, Invergowrie, Dundee, Scotland, DD2 5DA


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