@article {9311, title = {Morphological discrimination of Aphis gossypii (Hemiptera: Aphididae) populations feeding on Compositae}, journal = {Bulletin of Entomological ResearchBulletin of Entomological Research}, volume = {96}, year = {2006}, pages = {153-165}, keywords = {Homoptera}, author = {Margaritopoulos, J. T. and Tzortzi, M. and Zarpas, K. D. and Tsitsipis, J. A. and Blackman, R. L.} } @article {3653, title = {Distribution of common genotypes of Myzus persicae (Hemiptera : Aphididae) in Greece, in relation to life cycle and host plant}, journal = {Bulletin of Entomological ResearchBulletin of Entomological ResearchBulletin of Entomological Research}, volume = {97}, number = {3}, year = {2007}, note = {ISI Document Delivery No.: 183IGTimes Cited: 7Cited Reference Count: 49}, month = {Jun}, pages = {253-263}, type = {Article}, abstract = {Microsatellite genotyping was used to identify common clones in populations of the Myzus persicae group from various hosts and regions in mainland Greece and southern Italy and to compare their distribution and occurrence on tobacco and other crops. Common clones were defined as genotypes collected at more than one time or in more than one population; and, therefore, unlikely to be participating in the annual sexual phase on peach. Sixteen common genotypes were found, accounting for 49.0\% of the 482 clonal lineages examined. Eight of these genotypes were subjected, in the laboratory, to short days and found to continue parthenogenetic reproduction, i.e. they were anholocyclic. Four of the six commonest genotypes were red, and one of these accounted for 29.6\% of the samples from tobacco and 29.4\% of those from overwintering populations on weeds. All six commonest genotypes were found on weeds and five of them both on tobacco and on other field crops. In mainland Greece, the distribution of common clones corresponded closely with that of anholocyclic lineages reported in a previous study of life cycle variation. Common genotypes were in the minority in the commercial peach-growing areas in the north, except on weeds in winter and in tobacco seedbeds in early spring, but predominated further south, away from peach trees. This contrasts with the situation in southern Italy, reported in a previous paper, where peaches were available for the sexual phase, yet all samples from tobacco were of common genotypes.}, keywords = {aphid, ASEXUAL POPULATIONS, clones, cyclical parthenogenesis, GENETIC-VARIABILITY, INSECTICIDE, life cycle variation, Myzus persicae, NATURAL-POPULATIONS, nicotianae, NICOTIANAE HOMOPTERA, PARTHENOGENETIC SITOBION APHIDS, PEACH-POTATO APHID, PREDOMINANT CLONE, resistance, SULZER HEMIPTERA, Tobacco, tobacco aphid}, isbn = {0007-4853}, author = {Blackman, R. L. and Malarky, G. and Margaritopoulos, J. T. and Tsitsipis, J. A.} } @article {3654, title = {Electrophoretic distinction between the peach-potato aphid, Myzus persicae, and the tobacco aphid, M. nicotianae (Homoptera, Aphididae)}, journal = {Bulletin of Entomological ResearchBulletin of Entomological Research}, volume = {82}, number = {2}, year = {1992}, note = {Times Cited: 35ArticleEnglishCited References Count: 12Jc723}, month = {JUN}, pages = {161-165}, abstract = {The electrophoretic mobility of the enzyme glutamate oxaloacetate transaminase (GOT) on cellulose acetate plates was compared among sibling species of the Myzus persicae (Sulzer) group (M. persicae, M. nicotianae Blackman, M. antirrhinii (Macchiati)). M. persicae itself is monomorphic for GOT-1 (genotype ff), whereas European populations of M. nicotianae are polymorphic for this enzyme, with two forms of slightly different mobility (alleles s, f). In the samples of M. nicotianae examined, M. persicae-like ff genotypes were rare and heterozygotes (sf) were in large excess, even in samples from Greece where M. nicotianae has a regular holocycle (i.e., annual sexual reproduction). In North America, where M. nicotianae is probably entirely anholocyclic, samples of both red and green colour morphs of this species were found to be heterozygous for GOT-1. The enzyme difference can thus provide a means of distinguishing most individual specimens, including trapped alatae, of M. persicae and M. nicotianae. The anholocyclic taxon M. antirrhinii appears to be a fixed heterozygote for GOT-1 and thus resembles most M. nicotianae, but can be distinguished electrophoretically from both M. persicae and M. nicotianae by its distinctive pattern of esterases.}, keywords = {populations, SULZER HEMIPTERA}, author = {Blackman, R. L. and Spence, J. M.} }