Showing papers on "Uroleucon published in 2015"

Aphidiinae (Hymenoptera, Braconidae) aphid parasitoids of Malta : review and key to species

Abstract: This paper brings an annotated list of the 16 aphid parasitoids detected up to 2015 in Malta. All the species were reared from identified aphid-plant associations. An illustrated key to the identification of the recorded species from Malta is provided. Taxonomy and peculiarities of the individual taxa are discussed and research outlines are also presented. Two species, Aphidius absinthii and Trioxys pallidus are newly recorded for the Maltese fauna, in association with Uroleucon inulae and Hoplocallis picta, respectively. The first host association has never been reported so far. The documented aphid fauna of the Maltese Islands indicates the probable existence of other species of aphid parasitoids that may be present in the archipelago, especially those already known in nearby Mediterranean territories.

Host Plant Affinity with Taxonomic Groups in Aphids -A Case Study

Abstract: Host taxonomic affinity of 18 species of Hyadaphis, Uroleucon compositae and Viteus vitifoliae was examined. It was observed that most Hyadaphis species alternate host with Lonicera in Caprifoliaceae (primary) and Apieceae (secondary)in their life cycle. Most monophagous species of this genus select plants from Caprifoliaceae or Apiaceae. In U. compositae 87% plants were associated with Asteraceae and in V. vitifoliae feeding was exclusively restricted to Vitaceae. A rational answer is needed to validate aphid responses to their specific host/family.

Residual toxicity of different insecticides against safflower aphid (Uroleucon compositae Theobald)

Abstract: Dimethoate at 0.03 per cent showed highest PT values of 909.16 and 861.7 and LT50 values to the tune of 7.68 and 7.07 days against nymphs of Uroleucom compositae as compared to other insecticides.

Host Plant Affinity with Taxonomic Groups in Aphids –A Case Study

Abstract: Host taxonomic affinity of 18 species of Hyadaphis, Uroleucon compositae and Viteus vitifoliae was examined. It was observed that most Hyadaphis species alternate host with Lonicera in Caprifoliaceae (primary) and Apieceae (secondary)in their life cycle. Most monophagous species of this genus select plants from Caprifoliaceae or Apiaceae. In U. compositae 87% plants were associated with Asteraceae and in V. vitifoliae feeding was exclusively restricted to Vitaceae. A rational answer is needed to validate aphid responses to their specific host/family.

Caracterização Morfológica do Sifúnculo de Aphididae com Auxílio de Microscopia Eletrônica

Abstract: The aim of this work was to characterize the morphology of the siphunculi of the aphid Uroleucon ambrosiae (Thomas, 1878) (Hemiptera: Aphididae) by using scanning eletronic microscopy. The study was conducted in the laboratory of Nematology and Electron Microscopy, Plant Health Department, Universidade Estadual Paulista (UNESP), in the city of Jaboticabal, Brazil. The Uroleucon ambrosiae was collected in the field and, next, we prepared 5 samples from the aphids which were submitted to processes of preparation in order to be, afterwards, observed and photographed by Scanning Electronic Microscopy. Based on the studies, it was possible to observe that the siphunculi of U. ambrosiae presents tubular shape and rough appearance with an opening in the form of “U”. The morphological observationsof this aphid’s siphunculi are a very important factor in the recognition of this species, helping in the differentiation of other existing aphids.