Microtheca spp. (Coleoptera: Chrysomelidae) are insect pests primarily related to Brassicaceae crops. In the State of Rio Grande do Sul (RS), southern Brazil, they are found on forage turnip, Raphanus sativus L. var. oleiferus Metzg., which is commonly grown during fall/winter seasons. This work reports the predation of Microtheca spp. larvae by Toxomerus duplicatus Wiedemann, 1830 (Diptera: Sy...


 Schwebfliegen (Syrphidae) sind wichtige Bestäuber für unsere heimische Pflanzenwelt. Sie stechen nicht, aber oft schwarz-gelb gefärbt wie stechende Wespen oder Bienen und deshalb ein gutes Beispiel Mimikry. In unseren Gärten kommen verschiedene Arten vor. Nicht alle lassen sich anhand von Fotos sicher bestimmen. Einige auffällige ihre Bedeutung als werden hier kurz vorgestellt.

questions. Why, for example, did the two analytical approaches taken by Lander et al. [8] (a general linear model and a circuit model) come to opposing conclusions?Whichmechanismsmake one hostile habitat, clear-fells, act as a barrier, while the hostile pine plantations enhanced connectivity? Andhowmight theCirce principle apply to the main pollinator taxon, bees (Hymenoptera: Apiformes), which...

A new species of the genus Platycheirus Le Peletier et Serville, 1828 (Diptera, Syrphidae) is described from the Taimyr Peninsula (North of Krasnoyarsk Region). The new species belongs to the manicatus subgroup, being close to P. groenlandicus Curran, 1927, but differing by the narrower angle of approximation of the eyes (approximately equal 90 degrees) and the presence of short black setae on ...

Wildflower strips and biodiversity-friendly management are promoted as ways of enhancing biodiversity natural pest control in agroecosystems. Their efficacy for providing resources shelters enemies has been well studied, but little is known about how wildflower strip mediated by local field landscape composition. In this study, we explored the effects floral perennial flower on faba bean aphids...

Allograptaterraenovae sp. n. and Allograptanotiale sp. n. are described from Australia. Notes on the Australian species of Allograpta and an identification key to them are also given. The lectotype of Allograptajavana Wiedemann is designated, and the species Syrphuspallidus Bigot is synonymized under Allograptaaustralensis (Schiner).