Secondary host plant colonization by aphids involves alate and apterous morphs to spread in the population at a large scale by flying or, at a finer one, by walking. Macrosiphum euphorbiae Thomas (Hemiptera: Aphididae) and Myzus persicae Sulzer (Hemiptera: Aphididae) are two polyphagous aphids that cause serious losses on many crops, particularly on potato, Solanum tuberosum L. (Solanales: Sola...

Insect pests can reduce wheat yield by direct feeding and transmission of plant viruses. Here we report results from laboratory and field phenotyping studies on a wide range of wheat, including landraces from the Watkins collection deriving from before the green revolution, more modern cultivars from the Gediflux collection (north-western Europe) and modern UK Elite varieties, for resistance to...

Intracellular punctures by aphid stylets appear as potential drop (pd) waveforms in DC electrical penetration graph (EPG) recordings. We used a dual-EPG device that recorded in one channel the ‘full EPG’ with R-plus emf-components (i.e., the usual DC EPG) and concurrently in a second channel the ‘R-EPG’ with R-components only. The circuit of the latter channel was an optimised amplitude modulat...

The endemic South American aphid genus Neuquenaphis (Hemiptera, Aphididae, Neuquenaphidinae) forms an important component of the phytophagous insect fauna associated with southern beeches, Nothofagus (Nothofagaceae), but has not previously been studied cytologically. As part of ongoing studies of the taxonomy, evolution and host relationships of this genus, the karyotypes of 12 species are desc...

A total of 25 aphid species were collected from 49 ornamental plant species in São Carlos-São Paulo, Brazil; 12 aphids were monophagous, four oligophagous and nine polyphagous. A total of 58 aphid-plant associations are recorded, 43 unknown from Brazil. Eucarazzia elegans (Ferrari, 1872) (Aphididae: Aphidinae: Macrosiphini) is recorded for the first time from Brazil, and Nectandra megapotamica ...

We present the first and southernmost records of the fungi Hirsutella strigosa Petch, H. citriformis Speare (Ascomycota: Hypocreales), and Pandora nouryi (Remaudière & Hennebert) Humber (Zygomycota: Entomophthorales) infecting Doru lineare (Eschscholtz) (Dermaptera: Forficulidae), Ectopsocus californicus (Banks) (Psocodea: Ectopsocidae), and Heterocaecilius sp. (Psocodea: Pseudocaeciliidae), re...