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Strawberry blossom weevil Anthonomus rubi Herbst (Col.: Curculionidae): relationships between bud damage, weevil density, insecticide use, and yield


The activity of overwintered strawberry blossom weevils, Anthonomus rubi Herbst, measured as cut buds and adult weevils, was recorded weekly in sprayed and unsprayed quadrats in young and old strawberry plantings. The study was done in nine ‘Korona’ fields in a district with high A. rubi density, in the southeast of Norway, in 2000. During the period of study, the cumulative number of cut buds and adult weevils found by tapping whole plants above a bowl were highly correlated. An increase in sampled weevils was followed by an increase in cut buds 1–2 weeks later. Thus, sampling adults has potential for predicting the bud damage. In five of the six fields where yield was measured, a negative relationship between cut buds and the saleable yield was found. The effect of spraying was relatively low: A. rubi activity was reduced by 21% and the saleable yield increased by 16%. We conclude that present spraying practices are not very efficient in preventing A. rubi damage in the area studied.

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We are grateful to the growers who let us study their fields. A. Sønsteby, the staff at Planteforsk Kise, S. Kråkevik and T. Våge helped with equipment and/or practical advice during the field-work. We are also grateful to E. Hågvar and T. Hofsvang for commenting on various drafts of the manuscript, to T. Rafoss and A. Aastveit for valuable statistical discussions, to T. Kvamme for identification of weevils, to M. Aasen and two reviewers for improving the English and to R. Faby and K. Jensen for information on A. rubi in Germany and Sweden. The study was financially supported by the strawberry grower association of Ringsaker, and Norwegian Institute for Agricultural and Environmental Research (formerly The Norwegian Crop Research Institute).

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Correspondence to Nina Trandem.

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Communicated by Jürgen Gross

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Aasen, S.S., Trandem, N. Strawberry blossom weevil Anthonomus rubi Herbst (Col.: Curculionidae): relationships between bud damage, weevil density, insecticide use, and yield. J Pest Sci 79, 169–174 (2006).

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  • Anthonomus rubi
  • Norway
  • Pesticide resistance
  • Strawberries
  • Strawberry blossom weevil