Epigeal aphidophagous predators and the role of alfalfa as a reservoir of aphid predators for arable crops

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2005Suggested citation
Pons i Domènech, Xavier;
Núñez, Eva;
Lumbierres i Bardají, Belén;
Albajes Garcia, Ramon;
.
(2005)
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Epigeal aphidophagous predators and the role of alfalfa as a reservoir of aphid predators for arable crops.
European Journal of Entomology, 2005, vol. 102, núm. 3, p. 519-525.
https://doi.org/10.14411/eje.2005.074.
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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.
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European Journal of Entomology, 2005, vol. 102, núm. 3, p. 519-525European research projects
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