Overwintering in Pemphigus bursarius (L.)


ALTHOUGH many aphids overwinter in the egg stage, several species can overwinter in the adult stage as parthenogenetic morphs (Aphis pseudobrassicae Davis1, some Dysaphis Börner spp.2, Aphis gosypii Glover3, Pemphigus betae Doane4, etc.). The physiological mechanisms involved in overwintering by the parthenogenetic morphs of aphids have not been widely studied. I have used Pemphigus bursarius L., which can overwinter as adult virginoparae even in the absence of the host plant5, to show that overwintering adults are physiologically distinct from virginoparae living on lettuce roots during the summer.

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    Stroyan, H. L. G., A Revision of the British spp. of Dysaphis Börner, Part II. The subgenus Dysaphis sensu stricto (Ministry of Agriculture, Fisheries and Food, London, HMSO, 1963).

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JUDGE, F. Overwintering in Pemphigus bursarius (L.). Nature 216, 1041–1042 (1967). https://doi.org/10.1038/2161041b0

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