TY - JOUR

T1 - Wind-modulated landscape effects on colonization of Brussels sprouts by insect pests and their syrphid antagonists

AU - Ludwig, Martin

AU - Schlinkert, Hella

AU - Meyhöfer, Rainer

N1 - Funding information: We thank the 18 farmers and their staff for support. We also thank André Brun, Sergej Gulidov, Seraphine Herrmann, Robert Lessing, Timo Michel, Nils Plump, Hans-Joachim Seelbinder, Florian Vogt, Anna Walter and Wael Yakti for their help in the field and laboratory; Péter Batáry for advice; and Hans-Michael Poehling and three anonymous reviewers for their comments and suggestions. We thank our project partners at Julius Kühn-Institut for providing the ATKIS maps. This research is part of the ‘BMBF-AgroClustEr: WeGa-Kompetenznetz Garten-bau’ and was funded by the ‘Bundesministerium für Bildung und Forschung’ (grant number 0315542A).

PY - 2018/5

Y1 - 2018/5

N2 - Most crop fields are annually cleared, including arthropod populations. Recolonization depends on the source habitat presence in the landscape and often is affected by weather conditions. The present study identified source habitats and the effects of temperature and prevailing wind direction on colonization of Brussels sprouts by pests and their natural enemies. We sampled arthropods on standardized monitoring plants in 18 landscapes with different areas of potential source habitats. Most abundant pests and antagonists were Aleyrodes proletella, Brevicoryne brassicae, Plutella xylostella and syrphid larvae. Variation in A. proletella colonization was best explained by the upwind area of oilseed rape (positive effect) and temperature (negative effect). Variation in B. brassicae colonization was best explained by the downwind area of oilseed rape (positive effect), whereas no effects on P. xylostella were found. Syrphid colonization was affected by prey abundance only (positive effect). The results of the present study suggest that A. proletella was transported downwind, whereas B. brassicae located host plants during an upwind flight for approximately 1 km. This is remarkable for aphids with often limited upwind flight ability. Consideration of prevailing wind directions improves forecasting of the colonization intensity by pests from important source habitats.

AB - Most crop fields are annually cleared, including arthropod populations. Recolonization depends on the source habitat presence in the landscape and often is affected by weather conditions. The present study identified source habitats and the effects of temperature and prevailing wind direction on colonization of Brussels sprouts by pests and their natural enemies. We sampled arthropods on standardized monitoring plants in 18 landscapes with different areas of potential source habitats. Most abundant pests and antagonists were Aleyrodes proletella, Brevicoryne brassicae, Plutella xylostella and syrphid larvae. Variation in A. proletella colonization was best explained by the upwind area of oilseed rape (positive effect) and temperature (negative effect). Variation in B. brassicae colonization was best explained by the downwind area of oilseed rape (positive effect), whereas no effects on P. xylostella were found. Syrphid colonization was affected by prey abundance only (positive effect). The results of the present study suggest that A. proletella was transported downwind, whereas B. brassicae located host plants during an upwind flight for approximately 1 km. This is remarkable for aphids with often limited upwind flight ability. Consideration of prevailing wind directions improves forecasting of the colonization intensity by pests from important source habitats.

KW - Brassica crop

KW - cabbage aphid

KW - cabbage whitefly

KW - diamondback moth

KW - hoverfly

KW - landscape configuration

KW - spillover

KW - wind dispersal

UR - http://www.scopus.com/inward/record.url?scp=85020754796&partnerID=8YFLogxK

U2 - 10.1111/afe.12237

DO - 10.1111/afe.12237

M3 - Article

AN - SCOPUS:85020754796

VL - 20

SP - 141

EP - 149

JO - Agricultural and forest entomology

JF - Agricultural and forest entomology

SN - 1461-9555

IS - 2

ER -