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- Anderbjörk, Jan Erik
(författare)
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Gravundersökningar vid Brunnby i Vendel
- 1935
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Ingår i: Fornvännen. - 0015-7813 .- 1404-9430. ; 30, s. 158-163
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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- Anderbrant, O.
(författare)
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A model for the temperature and density dependent reemergence of the bark beetle Ips typographus
- 1986
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Ingår i: Entomologia Experimentalis et Applicata. - : Wiley. - 0013-8703. ; 40:1, s. 81-88
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Tidskriftsartikel (refereegranskat)abstract
- A model is presented that describes the reemergence of parent spruce bark beetles, Ips typographus, based on breeding density and temperature conditions. Laboratory data obtained at one constant temperature provide the distribution of reemergence time and different combinations of threshold temperatures and degreedays (°D) at mean reemergence. Of these combinations, 167.71 °D above 7.5 °C gave the best correspondence between model prediction and field data obtained from densely infested standing trees. The model was in good agreement with the reemergence pattern found for two groups of infested logs under different temperature conditions when adjusted for the lower breeding density. The applicability of the model in the study of bark beetle reproductive biology and in forest management is discussed. The method used to construct the model should be useful in developing other models for poikilothermic processes. Modèle déconivant la réémergence d'Ips typographus en fonction de la température et de la densité Ce modèle décrit la réémergence d'adultes d'I. typographus L. (Coleoptera, Scolytidae) en fonction de la densité et de la température. Les résultats obtenus en laboratoire à des températures constantes fournissent la distribution des réémergences et pour les dates de réémergence moyenne les différentes combinaisons de température de seuil et de degré de jour (°D). De toutes ces combinaisons, 167.71 °D au‐dessus de 7,5 °C fournit la meilleure concordance entre les prévisions du modèle et les observations dans la nature à partir d'arbres fortement attaqués. Le modèle a montré un bon accord avec la réémergence observée dans deux groupes de branches attaquées dans différentes conditions de la température quand il a été ajusté aux faibles densités d'élevage. La discussion examine les possibilités d'application du modèle à l'étude de la biologie de la reproduction d'I. typographus et à l'aménagement forestier. La méthode utilisée pour construire le modèle pourrait être employée pour en développer d'autres chez des poikilothermes. 1986 The Netherlands Entomological Society
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- Anderbrant, Olle, et al.
(författare)
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Development of mating disruption for control of pine sawfly populations
- 1995
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Ingår i: Entomologia Experimentalis et Applicata. - : Wiley. - 0013-8703. ; 74:1, s. 83-90
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Tidskriftsartikel (refereegranskat)abstract
- Mating disruption of the pine sawfly Neodiprion sertifer (Geoffroy) (Hymenoptera: Diprionidae) was strongly indicated by reduced male trap catches in pine plantations permeated with the sex pheromone, (2S, 3S, 7S)‐diprionyl acetate. The trap catch reduction was 95 to near 100% when dispensers every 10 m were used, giving a total release of about 3 mg per hectare and day. Two mg of pheromone per cotton roll dispenser maintained low catches for the whole season (about 2 months) without any renewal of disruption dispensers. An erythro‐mixture was as effective as the pure pheromone isomer. The effects of the experiments on population density and sex ratio were not possible to investigate, due to a general collapse of the population, also outside experimental plots, the year after the experiments. 1995 The Netherlands Entomological Society
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- Anderbrant, O.
(författare)
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Dispersal of reemerged spruce bark beetles, Ips typographus (Coleoptera, Scolytidae) : a mark‐recapture experiment
- 1985
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Ingår i: Zeitschrift für Angewandte Entomologie. - : Wiley. - 0044-2240. ; 99:1-5, s. 21-25
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Tidskriftsartikel (refereegranskat)abstract
- An experiment to investigate the dispersal and supposed reattack by parent spruce bark beetles, Ips typographus (L.), was performed. More than 20,000 parent beetles were marked with fluorescent powder and immediately released from platforms when they reemerged from trees attacked during the spring swarming. Thirty‐eight marked and over 8000 unmarked beetles were trapped on sticky traps covering 21.6 m2 and placed on 21 trees within 30 m from the platforms. It was estimated that less than 4% of the trapped beetles had reemerged from trees within the 30 m. Verbreitung von ausgeflogenen Fichtenborkenkäfern, Ips typographus L. (Col., Scolytidae). Ein Markierungs‐Wiederfang‐Experiment Es wurde ein Experiment zur Ausbreitung und des Wiederbefalls durch Altkäfer von Ips typographus nach Verlassen ihrer ersten Brut durchgeführt. Mehr als 20 000 Käfer wurden beim Schlüpfen abgefangen, mit Fluoreszenz‐Puder markiert und von zwei Plattformen in unmittelbarer Nähe der Schlüpforte freigelassen. 38 markierte und mehr als 8000 unmarkierte Käfer wurden an Leimfallen (zusammen 21,6 m2), befestigt an 21 Bäumen in maximaler Entfernung von 30 m von den zwei Plattformen, gefangen. Es wird geschätzt, daß weniger als 4% der gefangenen Käfer aus den in Plattformnähe (30 m) befindlichen Brutbäumen stammten. 1985 Blackwell Verlag GmbH
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- Anderbrant, Olle, et al.
(författare)
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Electrophysiological responses of carrot psyllids (Trioza apicalis), in different phases of their life cycle, to volatile carrot and conifer compounds
- 2020
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Ingår i: Journal of Applied Entomology. - : Wiley. - 0931-2048 .- 1439-0418. ; 144:3, s. 236-240
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Tidskriftsartikel (refereegranskat)abstract
- Carrot psyllids (Trioza apicalis) pose a constant threat to carrot production in parts of Europe, and treatments with chemical insecticides are common. To be able to develop alternative control tactics, more knowledge about the psyllid's host-finding behaviour and underlying physiology is needed. Using single-sensillum recordings from overwintered and non-overwintered males and females, we found essentially identical responses for the two groups and for both sexes. Using six compounds emanating from carrots or conifers, the psyllids' overwintering plants, and extracts of carrot leaves, five different olfactory sensory neuron classes could be distinguished from our high-quality recordings, viz. #1 responding strongly and exclusively to terpinene-4-ol, #2 responding strongly and most often exclusively to nonanal, #3 responding moderately strongly to terpinolene, #4 responding strongly to (Z)-3-hexenal and most often weaker to terpinolene, #5 responding exclusively to carrot extract.
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- Anderbrant, O., et al.
(författare)
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Feeding by Scolytus bark beetles to test for differently susceptible elm varieties
- 2017
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Ingår i: Journal of Applied Entomology. - : Wiley. - 0931-2048 .- 1439-0418. ; 141:5, s. 417-420
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Tidskriftsartikel (refereegranskat)abstract
- Dutch elm disease (DED), caused by the fungi Ophiostoma ulmi and O. novo-ulmi, has reduced elm populations severely in Europe and North America. Breeding programmes are in action to find less susceptible elm varieties suitable for re-establishing elm stands. Bark beetles, mainly Scolytus spp., are the only known natural vectors of DED. During twig feeding, beetles transfer Ophiostoma spores to healthy elms. Thus, less palatable elms should run a lower risk of DED infections. In feeding preference bioassays, we offered twigs from elms exhibiting different degree of susceptibility to O. novo-ulmi, together with non-host trees to Scolytus beetles. Scolytus multistriatus preferred wych elm, Ulmus glabra, to 100% in two-choice tests, whereas S. laevis did not discriminate between a tolerant and a susceptible variety of field elm, U. minor. We suggest that the feeding assay is useful as a low-tech method in breeding programmes for evaluating the suitability of promising elm genotypes to vector insects.
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