Epigeal aphidophagous predators and the role of alfalfa as a reservoir of aphid predators for arable crops
MetadataShow full item record
The relative occurrence and seasonal abundance of aphidophagous predators (Insecta and Arachnida) were determined in alfalfa fields at two locations in the northeast Iberian Peninsula, using D-Vac and sweep-net sampling techniques. Among the insects, Heteroptera, Dermaptera, Neuroptera, Coleoptera
and Diptera were found. The relative abundance of predators was similar at the two locations. Polyphagous predators were much more abundant than aphid specific species. Heteroptera were the most abundant order of insect predators: members of the Nabidae, Anthocoridae and Miridae were very common. Coleoptera were also abundant, represented mainly by the family Staphylinidae. Coccinellidae were less abundant and their occurrence coincided with maximum aphid presence. There was a low occurrence of other aphid-specific predators, i.e. Diptera: Syrphidae and Neuroptera: Chrysopidae. Arachnida varied between localities (from 35% to 65%). Over a five-year period, numerical responses by Orius spp., Nabis provencalis and Coccinellidae to aphids were found using polynomial regression models; however the abundance of predators was weakly explained by aphid abundance. Alfalfa, maize and winter cereals share similar aphid predator groups and these crops partially coincide in time, enabling the movement of predators among crops. The persistence of several predatory groups (Anthocoridae, Nabidae, Staphylinidae, Araneae) during most of the season suggests that alfalfa plays a major role as a reservoir of aphid predators.
Is part ofEuropean Journal of Entomology, 2005, vol. 102, núm. 3, p. 519-525
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as cc-by (c) Czech Academy of Sciences. Institute of Entomology of the Biology Centre, 2005
Showing items related by title, author, creator and subject.
Pons i Domènech, Xavier; Lumbierres i Bardají, Belén; Albajes Garcia, Ramon (Czech Academy of Sciences. Institute of Entomology of the Biology Centre, 2009)The relationships between predatory Heteroptera and their potential prey species were investigated during two crop seasons in an inter-mountain area close to the Pyrenees (Iberian Peninsula). Regression was used to analyze ...
Pons i Domènech, Xavier; Lumbierres i Bardají, Belén; López Alonso, Carmen; Albajes Garcia, Ramon (Czech Academy of Sciences. Institute of Entomology of the Biology Centre, 2005)The impact of transgenic Bt-maize, expressing the Cry1Ab protein, on aphids, leafhoppers, cutworms and wireworms was evaluated at the farm scale by comparing their abundance on Bt-plots and those sown with the isogenic ...
Changes in arthropod fauna from weed management practices in genetically modified herbicide-tolerant maize Albajes Garcia, Ramon; Lumbierres i Bardají, Belén; Pons i Domènech, Xavier; Comas i Angelet, Jordi (Canadian Center of Science and Education (CCSE), 2014)Genetically modified maize tolerant to broad-spectrum herbicides may greatly alter weed flora composition, abundance and therefore affect organisms of higher trophic levels, including herbivore and detritivore arthropods and ...