Effects of Iberis umbellata (Brassicaceae) on insect pests of cabbage and on potential biological control agents

Noncrop borders surrounding field crops may enhance biological control of insect pests by drawing pests away from the crop and by providing a suitable habitat for natural enemies. We quantified the effects of borders of flowering Iberis umbellata L. (candytuft) on cabbage pest and predator abundance...

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Bibliographic Details
Published in:Environmental entomology 1998-02, Vol.27 (1), p.161-167
Main Authors: Bigger, D.S. (University of Washington, Seattle, WA.), Chaney, W.E
Format: Article
Language:English
Subjects:
AUXILIAIRE DE LUTTE BIOLOGIQUE
Biological and medical sciences
BIOLOGICAL CONTROL
BIOLOGICAL CONTROL ORGANISMS
BORDER EFFECTS
BRASSICA OLERACEA
Control
CONTROL BIOLOGICO
CONTROL CULTURAL
CRUCIFERAE
CULTIVOS TRAMPA
CULTURAL CONTROL
CULTURE PIEGE
DENSIDAD DE LA POBLACION
DENSITE DE POPULATION
DEPREDADORES
DISTRIBUCION ESPACIAL
DISTRIBUTION SPATIALE
ENEMIGOS NATURALES
ENNEMI NATUREL
EXPERIMENTACION EN CAMPO
EXPERIMENTATION AU CHAMP
FIELD EXPERIMENTATION
Fundamental and applied biological sciences. Psychology
INSECTE NUISIBLE
INSECTOS DANINOS
LUTTE BIOLOGIQUE
LUTTE CULTURALE
NATURAL ENEMIES
ORGANISMOS PARA CONTROL BIOLOGICO
OVA
OVIPOSICION
OVIPOSITION
OVULE
OVULO
PEST INSECTS
Phytopathology. Animal pests. Plant and forest protection
PIERIS RAPAE
PONTE
POPULATION DENSITY
PREDATEUR
PREDATORS
Protozoa. Invertebrates
SPATIAL DISTRIBUTION
TRAP CROPS
TRICHOPLUSIA NI
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Summary:Noncrop borders surrounding field crops may enhance biological control of insect pests by drawing pests away from the crop and by providing a suitable habitat for natural enemies. We quantified the effects of borders of flowering Iberis umbellata L. (candytuft) on cabbage pest and predator abundance by repeatedly sampling arthropod abundance in plots of Brassica oleracea L. I. umbellata provides potential food for crucifer herbivores as well as nectar and pollen resources for predators. Althougj I. umbellata harbored large populations of hemipteran predators, few of these predators were found on the adjacent crop plants. Iberis borders did not change the abundance of crop pests within the crop but had mixed effects on natural enemies. Interestingly, the spatial distribution of Pieris rapae L. and Trichoplusia ni (Hubner) eggs on B. oleracea differed significantly between treatments, indicating that the presence of flowering I. umbellata may have altered the movement and oviposition behavior of these lepidopteran pests. Our results point to the importance of considering predator and pest movement when investigating how alternative habitats, such as flowering borders, affect arthropod population dynamics
ISSN:0046-225X
1938-2936
DOI:10.1093/ee/27.1.161