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SAMPLING POPULATIONS OF THE IMPORTED CRUCIFER WEEVIL, BARIS LEPIDII (COLEOPTERA: CURCULIONIDAE), IN COMMERCIAL HORSERADISH

Published online by Cambridge University Press:  31 May 2012

Daniel W. Sherrod
Affiliation:
Section of Economic Entomology, Illinois Natural History Survey, and Department of Entomology, University of Illinois, Champaign 61820
Catherine E. Eastman
Affiliation:
Section of Economic Entomology, Illinois Natural History Survey, and Department of Entomology, University of Illinois, Champaign 61820
William G. Ruesink
Affiliation:
Section of Economic Entomology, Illinois Natural History Survey, and Department of Entomology, University of Illinois, Champaign 61820
Roscoe Randell
Affiliation:
Section of Economic Entomology, Illinois Natural History Survey, and Department of Entomology, University of Illinois, Champaign 61820

Abstract

The imported crucifer weevil, Baris lepidii Germar, was sampled in commercial horseradish fields by pitfall traps, visual counts, baits, soil cores, and square area removal. Adult counts from soil cores taken directly over the plant crown were closely related to those from 0.25 m2 samples centered around the whole plant. Numbers of adults determined by relative sampling techniques such as visual counts, pitfall traps, and baits were not closely related to the number of adults recovered in soil cores. All of the fields examined had adult weevils present at planting time as indicated by bait catches. No sampling method was an adequate predictor of the percentage of horseradish roots infested with B. lepidii at harvest.

Résumé

Le charançon importé des crucifères, Baris lepidii Germar, a été échantillonné dans des champs commerciaux de raifort au moyen de pièges, de comptages visuels, d'appâts, et du prélèvement de carottes et de quadrats de sol. Les nombres d'adultes trouvés dans des carottes de sol prélevées juste au-dessus de la couronne de la plante se sont révélés étroitement corrélés aux nombres trouvés dans des quadrats de 0.25 m2 centrés sur la plante. Les nombres d'adultes obtenus par les techniques d'échantillonnage relatives comme les comptages visuels, les pièges et les appâts n'étaient pas corrélés étroitement avec les nombres trouvés dans les carottes de sol. Des charançons adultes étaient présents dans tous les champs examinés au moment des semis, tel qu'indiqué par les nombres capturés avec les appâts. Aucune des techniques d'échantillonnage ne s'est avérée adéquate pour prédire le pourcentage des racines de raifort infestées de B. lepidii au moment de la récolte.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1984

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