Macrosiphoniella

About: Macrosiphoniella is a research topic. Over the lifetime, 34 publications have been published within this topic receiving 403 citations.

Cross-species amplification of microsatellite loci in aphids: assessment and application

Abstract: Despite the relative ease of isolating microsatellites, their development still requires substantial inputs of time, money and expertise For this reason there is considerable interest in using existing microsatellites on species from which markers were not cloned We tested cross-species amplification of 48 existing aphid loci in species of the following genera: Aphidinae: Aphidini: Aphis and Rhopalosiphum ; Aphidinae: Macrosiphini: Acyrthosiphum , Brevicoryne , Diuraphis , Illinoia , Macrosiphoniella , Macrosiphum , Metopeurum , Metapolophium , Myzus , Phorodon , Sitobion and Uroleucon and Neuquenaphidinae: Neuquenaphis Our results show cross-species application of known microsatellite loci is a highly promising source of codominant markers for population genetic and evolutionary studies in aphids

Phylogenetics and evolution of the aphid genus Uroleucon based on mitochondrial and nuclear DNA sequences

Abstract: The genus Uroleucon, and the related genus Macrosiphoniella, represent a large Tertiary radiation of aphids, with a total of about 300 species distributed throughout the world, primarily on host plant species in the family Asteraceae. A molecular phylogenetic study was conducted to identify major clades within Uroleucon and to address the cladistic validity of current subgeneric categories, the evolution of host plant associations, the age of origin, and intercontinental movements in this genus. The seventeen study species included members of the three major subgenera of Uroleucon, species from Europe and North America, one member of Macrosiphoniella, and two outgroups. Data consisted of DNA sequences for three mitochondrial regions and the nuclear gene EF1alpha, for a total of 4287 sites. Nodes supported strongly in both parsimony and maximum likelihood analyses suggest that: (1) Nearctic Uromelan are a monophyletic group branching near the base of the genus and not related to European Uromelan, (2) the New World subgenus Lambersius is possibly monophyletic but is not a tightly related group and is not closely related to other North American species, and (3) Nearctic members of subgenus Uroleucon are a closely related monophyletic group not allied with Nearctic Uromelan or Lambersius. Instead they represent a separate colonization by an Old World ancestor, as they are nested within a strongly supported clade containing European members of both subgenera Uroleucon and Uromelan. Neither of these subgenera is monophyletic. Molecular clock calculations, based on calibrations of mitochondrial divergences from other insects, suggest that Uroleucon + Macrosiphoniella is a relatively recent radiation, probably no more than 5-10 million years old. Although largely confined to Asteraceae, this clade did not radiate in parallel with its host plants. Rather, lateral movement between lineages of Asteraceae must have occurred repeatedly.

Pathogenicity ofVerticillium lecani conidia and blastospores against the aphid,Macrosiphoniella sanborni

Abstract: Under conditions of laboratory bioassay in which aphids were infected by total immersion in spore suspensions, blastospores of the entomopathogenic fungus,Verticillium lecanii (Zimm.)Viegas, were twice as pathogenic as conidia for the aphid,Macrosiphoniella sanborniGill., on a numerical basis. By comparison, on a live-spore volume basis blastospores, being larger, were only ×0.6 as pathogenic. Blastospores were also, numerically, more pathogenic when healthy aphids were infected from spore-covered leaf discs in the laboratory. LC50s of the 2 assay methods differed by more than × 100. In glasshouses, the 2 spore-types achieved similar levels of control ofM. sanborni.

On some mainly Western European Aphids

Abstract: 1. Ramitrichophorus nov. subgen. Macrosiphoniella janckei Borner, 1939 (Arb. phys. angew. Entom., vol. VI, p. 83), found on Helichrysum arenarium, differs from all species of Macrosiphoniella which I have seen in the structure of its hairs, rostrum and cauda. The dorsal hairs and partly those on the legs and antennae are long and not thicker than in other Macrosiphoniella's but their apex is flattened and ramose, sometimes bifid. The ultimate rostral segment is Fig. 1. Ramitrichophorus janckei (Borner), apt. viv. fern.: a, siphunculus; b, cauda; c, last rostral segments. X 140. exceedingly long and narrow, about 1 2/3 times as long as second joint of hind tarsi and nearly 5/6 of the siphunculi. The hairs on this joint are very short and thin, while in typical Macrosiphoniella the longest hairs stand on basal half. The cauda is shortly triangular and acute. Scleroites are vaguely visible in the specimen which I received, and antesiphuncular sclerites are present. It seems desirable, with regard to the shape of the ultimate rostral segment, hairs and cauda, to erect a separate subgenus for this species, Ramitrichophorus nov. subgen., type Macrosiphoniella janckei Borner, 1939. 2. Macrosiphoniella chamomillae nov. spec. Apterous viviparous female. Morphological characters. Body rather large, spindle-shaped, about 2.703.15 mm long. Hairs not on distinct scleroites, rather long; VIIIth abd. tergite with 6 hairs. Antesiphuncular sclerites absent or colourless. Head faintly dusky, with the sides between the bases of the antennae and the

Aphidiinae parasitoids (Hymenoptera: Braconidae) of Macrosiphoniella aphids (Hemiptera: Aphididae) in the western Palaearctic region

Abstract: The parasitoids (Hymenoptera: Braconidae: Aphidiinae) of Macrosiphoniella del Guercio (Hemiptera: Aphididae) from the western Palaearctic region are reviewed and keyed. The host associations and distribution of each species are summarized. Aphidius stigmaticus sp. nov. reared from Macrosiphoniella tanacetaria on Tanacetum polycephalum, which is another member of the Macrosiphoniella aphid parasitoid guild from high-mountain habitats in western Iran, is described in the present contribution. Some taxonomic problems within Macrosiphoniella parasitoid guilds are discussed as well.