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| Content Provider | Springer Nature Link |
|---|---|
| Author | Evans, E. W. Richards, D. R. |
| Copyright Year | 1997 |
| Abstract | We tested whether large-scale distributions of aphidophagous ladybirds could be manipulated by localized application of artificial honeydew. In addition to enhancing local build-up of ladybird numbers (e.g., in areas of incipient aphid outbreak), such an approach may prove useful for drawing ladybirds out of a crop scheduled for insecticide treatment. In six experiments, we sprayed sucrose dissolved in water to small plots in the center of large alfalfa fields in Utah. Within 48 hours, ladybird densities in the plots increased 2–13x, whereas ladybird densities at distances of 40–150 m from the plots decreased to a mean of less than two-thirds their former density. We then applied sucrose in a narrow band along the entire perimeter of an alfalfa field; densities of ladybirds increased following treatment both along the treated field edge and in untreated alfalfa throughout the field. Finally, we compared the numerical responses of two ladybird species to sucrose application; both species responded positively, butCoccinella transversoguttata did so consistently more strongly than didC. septempunctata. Our results suggest that both promise and challenges lie in the use of artificial honeydew to direct the dispersal and spatial patterns of ladybirds.Nous avons essayé de voir s’il était possible d’agir sur la distribution à grande échelle des coccinelles aphidiphages par une application localisée de miellat artificiel. Outre le renforcement de la multiplication locale des coccinelles (par exemple dans des zones de pullulation naissante de pucerons), une telle approche peut se révéler utile pour attirer les coccinelles en dehors d’une culture dans laquelle un traitement insecticide est prévu. Au cours de 6 essais, nous avons pulvérisé du saccharose dissous dans de l’eau sur de petites parcelles situées au centre de vastes champs de luzerne, en Utah. Dans les 48 heures, les densités de coccinelles dans ces parcelles ont augmenté entre 2 et 13 fois, alors que les densités de coccinelles dans les zones éloignées de 40 à 150 m de ces parcelles diminuaient jusqu’à une moyenne inférieure aux 2/3 de leur densité initiale. Nous avons ensuite pulvérisé du saccharose sur une bande étroite tout autour du périmètre d’un champ de luzerne; les densités de coccinelles ont augmenté à la suite du traitement tant sur la bordure traitée du champ, qu’à l’intérieur du champ de luzerne. Enfin nous avons comparé les réponses numériques de deux espèces de coccinelles suite à l’application de saccharose; les deux espèces répondent positivement maisCoccinella transversoguttata présente une réponse nettement plus forte queC. septempunctata. Nos résultats suggèrent que l’utilisation de miellat artificiel devrait permettre de modifier la dispersion et la répartition spatiale des coccinelles. |
| Starting Page | 93 |
| Ending Page | 102 |
| Page Count | 10 |
| File Format | |
| ISSN | 00138959 |
| Journal | BioControl |
| Volume Number | 42 |
| Issue Number | 1-2 |
| e-ISSN | 15738248 |
| Language | French |
| Publisher | Springer Netherlands |
| Publisher Date | 1997-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Entomology Plant Pathology Agriculture Animal Ecology Animal Biochemistry Behavioural Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Ecology, Evolution, Behavior and Systematics Agricultural and Biological Sciences |
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