Uroleucon

About: Uroleucon is a research topic. Over the lifetime, 150 publications have been published within this topic receiving 2266 citations.

Catálogo de los áfidos (Hemiptera, Aphididae) de Chile, con plantas hospedadoras y distribuciones regional y provincial

Abstract: Records of the aphid species and subspecies contained in 139 scientific contributions have been revised. New records of many species are presented from specimens conserved in the collections of Museum national d’Histoire naturelle (Paris, France), the Servicio Agricola y Ganadero (SAG) (Santiago, Chile), the Natural History Museum (London, U.K.), the universities of Leon (Spain) and Talca (Chile) and of J. Ortego (Mendoza, Argentina). The Chilean aphid-catalog is composed of 169 species and subspecies; Aphis (Toxoptera) citricidus, Aphis medicaginis, Aphis rumicis, Dysaphis apiifolia petroselini, Lipaphis erysimi and Uroleucon aaroni are excluded from the catalog. Aphis rubicola, Brachycaudus amygdalinus and Illinoia pepperi are first recorded from South America. Aphis forbesi, Aphis senecionicoides, Hyadaphis passerini, Hyperomyzus carduellinus, Illinoia azaleae, Neotoxoptera oliveri and Pentalonia nigronervosa are also recorded for first time from Chile. More a hundred new regional and provincial records are given. Host plant list of aphids recorded in Chile are presented for first time. The compositions of Chilean regional and provincial aphidfaunas are discussed. An evaluation of the allochthonous and autochthonous components of the Chilean aphidfauna is presented.

Family Aphididae : Part 1 of tribe Macrosiphini of subfamily Aphidinae

Abstract: This volume treats part of Macrosphini (Aphididae: Aphidinae), with keys to all genera occuring in Scandinavia or expected to be found there in the future and descriptions of some of them, including Anuraphis, Brevicoryne, Coloradoa and Cavariella; Myzus, Nasonovia, Capitophorus and Macrosiphum will be treated in the fifth volume, Uroleucon and Megoura in the sixth volume together with Lachnidae. It includes several drawings, taxonomical and biological notes and notes to distribution.

Electrical Penetration Graph analysis reveals population differentiation of host‐plant probing behaviors within the aphid species Uroleucon ambrosiae

Abstract: Uroleucon ambrosiae collected from the eastern and the southwestern United States were studied in relation to host-plant probing. In the field, eastern aphids are highly specific on Ambrosia trifida, while southwestern aphids feed on Ambrosia trifida plus many other species in the family Asteraceae. Electrical penetration graphs of insects on the principal host, A. trifida, and an additional host of southwestern populations, Heterotheca subaxillaris, revealed regional differentiation in host-associated aphid behaviors, specifically in the first phase of subcuticular probing, and in phloem finding activities. Eastern aphids used A. trifida more efficiently than southwestern aphids, but were demonstrably less vigorous in their probing activities on H. subaxillaris.

Parasitation of Uroleucon species (Hom., Aphididae) on thistles (Compositae, Cardueae).

Abstract: The aphid-parasitoid-hyperparasitoid food webs of different economic non-important Uroleucon spp. feeding on Cardueae were examined. Uroleucon spp. were attacked by a specialized complex of primary parasitoids which is restricted to this genus and some closely related genera. Aphidius funebris was the dominant parasitoid on all host aphids. Trioxys centaureae was co-dominant on U. jaceae, but rare on U. cirsii and is presumed to prefer the subgenus Uromelan within Uroleucon hosts. The primaries were attacked by a complex of 10 hyperparasitoid species. The rate of hyperparasitism increased during the vegetation period and reached its peak in late summer. The most abundant hyperparasitoids were Alloxystid wasps, Asaphes spp. and Dendrocerus carpenteri. Species composition (relative abundance and constancy) of the primary parasitoids and the hyperparasitoids showed remarkable correspondences in the two growing seasons 1986 and 1987. Zusammenfassung Parasitierung von Blattlausen der Gattung Uroleucon (Homoptera, Aphididae) an Disteln (Compositae, Cardueae) Bei verschiedenen, wirtschaftlich nicht bedeutsamen, Blattlausen der Gattung Uroleucon, die an “Disteln” leben, wurden die Blattlaus-Parasitoid-Hyperparasitoid-Nahrungsnetze analysiert. Die untersuchten Uroleucon-Arten werden von einem spezialisierten Primarparasitoidenkomplex befallen, der auf Uroleucon spp. und einige sehr nahe verwandte Gattungen beschrankt ist. Der dominante Parasitoid bei allen untersuchten Wirten war Aphidius funebris. Trioxys centaureae stellt an U. jaceae die co-dominante Art dar, wahrend sie an U. cirsii nur sehr selten vorkommt. T. centaureae scheint innerhalb der Gattung Uroleucon die Untergattung Uromelan zu bevorzugen. Die Primarparasitoide wurden von einem aus zehn Arten bestehenden Hyperparasitoidkomplex befallen. Der Anteil hyperparasitierter Blattlause nahm im Lauf der Vegetationsperiode kontinuierlich zu und erreichte sein Maximum im Spatsommer. Die haufigsten Hyperparasitoiden waren verschiedene Gallwespenarten der Gattung Alloxysta, Asaphes spp. (Hym., Pteromalidae) und Dendrocerus carpenteri (Hym., Megaspilidae). In den Vegetationsperioden 1986 und 1987 zeigte die Zusammensetzung des Primar- und Hyperparasitoidenkomplexes (relative Haufigkeiten und Konstanz der Arten) bemerkenswerte Ubereinstimmungen.

New records of aphid species (Hemiptera: Aphidoidea) for the Turkish fauna from Samsun province.

Abstract: Nine aphid species from the Ondokuz Mayis University Kurupelit campus in Samsun province, Turkey, were determined as new records for the Turkish fauna. These species were Aphis helianthi Monell in Riley & Monell, 1879; Macrosiphum impatientis (Williams, 1911); Macrosiphum mordvilkoi Miyazaki, 1968; Macrosiphum pallidum (Oestlunt, 1887); Uroleucon pseudoambrosiae (Olive, 1963); Cinara maghrebica Mimeur, 1934; Cinara wahluca Hottes, 1952; Stomaphis cupressi (Pintera, 1965); and Maculolachnus submacula (Walker, 1848).