Feeding deterrence of Spodoptera exigua (Lepidoptera: Noctuidae) larvae by low concentrations of linear furanocoumarins

We conducted choice tests and behavioral observations of Spodoptera exigua (Hubner) larvae to study the effect of linear furanocoumarins (bergapten, xanthotoxin and psoralen) individually or in combination at concentrations commonly found in Apium graveolens L. and UV-A light on larval preference an...

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Bibliographic Details
Published in:Environmental entomology 1997-08, Vol.26 (4), p.912-919
Main Authors: Berdegue, M, White, K.K, Trumble, J.T
Format: Article
Language:English
Subjects:
ALELOQUIMICOS
ALLELOCHEMICALS
ANTIFEEDANTS
APIUM GRAVEOLENS
BERGAPTEN
Biological and medical sciences
COMPORTEMENT ALIMENTAIRE
Control
COUMARINE
COUMARINS
CUMARINAS
DIET
DIETA
FEEDING HABITS
FEEDING PREFERENCES
FITOTOXINAS
FOOD INTAKE
Fundamental and applied biological sciences. Psychology
FURANE
FURANOS
FURANS
HABITOS ALIMENTARIOS
INGESTION DE ALIMENTOS
INHIBIDORES DEL APETITO
Integrated pest control
LARVAE
LARVAS
LARVE
METHOXSALEN
PHAGOREPULSIF
Phytopathology. Animal pests. Plant and forest protection
PHYTOTOXINE
PHYTOTOXINS
PREFERENCE ALIMENTAIRE
PREFERENCIAS ALIMENTARIAS
PRISE ALIMENTAIRE (HOMME)
Protozoa. Invertebrates
PSORALEN
RADIACION ULTRAVIOLETA
RAYONNEMENT ULTRAVIOLET
REGIME ALIMENTAIRE
SPODOPTERA EXIGUA
SUBSTANCE ALLELOCHIMIQUE
SYNTHETIC DIETS
ULTRAVIOLET RADIATION
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Summary:We conducted choice tests and behavioral observations of Spodoptera exigua (Hubner) larvae to study the effect of linear furanocoumarins (bergapten, xanthotoxin and psoralen) individually or in combination at concentrations commonly found in Apium graveolens L. and UV-A light on larval preference and feeding behavior. Linear furanocoumarins had a negative and concentration-dependent effect on diet preference by S. exigua larvae. Behavioral observations showed that preference of control diet is the result of feeding deterrence by these compounds. The larvae leave the furanocoumarin-containing diet more frequently by becoming more mobile after ingestion of the treated diet as measured by time spent questing (in which larvae walk or lift their thoraxes, and move from side to side in a searching motion) and number of questing occurrences. The UV-A effect was not significant. We conclude that linear furanocoumarins (at the concentrations found in A. graveolens) can play an important role as behavioral modifiers rather than as toxic defenses against larvae of the generalist herbivore S. exigua
ISSN:0046-225X
1938-2936
DOI:10.1093/ee/26.4.912