Weeds, aphids, and specialist parasitoids and predators benefeit differently from organic and conventional cropping of winter cereals
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Tipus de documentArticle
Data publicació2011-12-28
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Abstract
The aphid–natural enemy interaction in winter
wheat fields constitutes a complex system that has been
frequently studied because of its implication for biological
control. However, not all of the aphids living in cereal
fields are crop pests, as there are also aphids living on
weeds that may serve as alternative hosts or prey for aphid
parasitoids or predators. In this context, a concomitant
survey of the plant and insect communities was conducted
to understand how different plant communities affect the
abundance and richness of aphids and the interactions with
their natural enemies. The plant community was split into
functional groups (grasses, legumes and forbs), and the
aphid community was divided into feeding groups
according to their host preferences (specialists in grasses or
forbs). The grass aphids, which dominated the total aphid
catches, responded positively to grass cover, which was
particularly enhanced in the conventional fields. Conversely,
the forb aphids, which mainly conditioned the total
species richness of the aphids, were closely correlated with
the local abundance of legumes. The system of cereal
aphid-parasitoids was enhanced in the conventional fields,
where the abundance of grasses was higher, whereas the
legumes of the organic fields indirectly played a key role in
enhancing the richness of the parasitoids and the abundance
of predators. Our findings indicate that a bottom-up
effect exists throughout the plant community, aphids, and
aphidophagous insects and that plant community characteristics
should
CitacióCaballero-López, B. [et al.]. Weeds, aphids, and specialist parasitoids and predators benefeit differently from organic and conventional cropping of winter cereals. "Journal of pest science", 28 Desembre 2011.
ISSN1612-4758
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weeds.pdf | 262,9Kb | Accés restringit |