| 1. |
- Lofstedt, Christer, et al.
(författare)
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Pheromone dialects in European turnip moths Agrotis segetum
- 1986
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Ingår i: Oikos. - : JSTOR. - 0030-1299. ; 46:2, s. 250-257
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Tidskriftsartikel (refereegranskat)abstract
- Female pheromone gland extracts from cultures of Agrotis segetum originating from Sweden, France, Hungary and England were analysed for pheromone components and precursors (fatty acids). The pheromone blends were similar in moths from the Swedish, English and Hungarian populations, whereas the French diverged with a much higher amount of (Z)-7-decenyl acetate relative to the homologous pheromone components (Z)-7-dodecenyl acetate and (Z)-9-tetradecenyl acetate. -from Authors
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| 2. |
- Löfstedt, Christer, et al.
(författare)
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Sex pheromone components of the turnip moth, Agrotis segetum - Chemical identification, electrophysiological evaluation and behavioral activity
- 1982
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Ingår i: Journal of Chemical Ecology. - 0098-0331. ; 8:10, s. 1305-1321
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Tidskriftsartikel (refereegranskat)abstract
- Analysis of female abdominal tips of Agrotis segetum by means of GC-MS showed the presence of 13 aliphatic acetates and alcohols. (Z)-7-Dodecenyl acetate was found to be the main component in the extracts at amounts of about 1 ng/female. (Z)-9-Tetradecenyl acetate and (Z)-7-dodecenol were present to the extent of 49 and 19%, respectively, of the main component. Minor components could be identified as decyl acetate, (Z)-5-decenyl acetate, dodecyl acetate, (Z)-9-dodecenyl acetate, tetradecyl acetate, a tetradecenyl acetate, hexadecyl acetate, a hexadecenyl acetate, (Z)-5-decenol, and (Z)-9-tetradecenol. The presence and biological activity of decyl acetate, (Z)-5-decenyl acetate, and (Z)-7-dodecenyl acetate in the extracts could be detected by GC-EAD. Tested by EAG (Z)-5-decenyl acetate evoked the highest response among pheromone candidates, followed by (E)-5-decenyl acetate and (Z)-7-dodecenyl acetate. Single-cell recordings from 100 male antennal sensilla trichodea revealed receptorcells highly sensitive to (Z)-5-decenyl, (Z)-7-dodecenyl, (Z)-8-dodecenyl, and (Z)-9-tetradecenyl acetate as well as (Z)-5-decenol. The (Z)-5-decenyl, (Z)-7-dodecenyl, and (Z)-9-tetradecenyl acetate receptors were activated significantly also by female extracts. When tested in a tube olfactometer, a blend of decyl, (Z)-5-decenyl, (Z)-7-dodecenyl, and (Z)-9-tetradecenyl acetate evoked the same male response as did female glands. Tested in the field, this blend was more attractive than virgin females. Other authors previously reported many of the compounds identified in the present study. However, both quantitative and qualitative discrepancies exist among the various investigations, possibly due to the existence of geographical races.
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| 3. |
- Löfstedt, Christer, et al.
(författare)
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SEX PHEROMONE OF THE CONE PYRALID DIORYCTRIA ABIETELLA
- 1983
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Ingår i: Entomologia Experimentalis et Applicata. - : Wiley. - 0013-8703. ; 34:1, s. 20-26
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Tidskriftsartikel (refereegranskat)abstract
- Gas chromatographic analyses coupled with electro‐antennographic detection indicated that (Z,E)‐9,11‐tetradecadienyl acetate (Z,E‐9,11–14Ac) is a pheromone component of the cone pyralid Dioryctria abietella. Gas chromatographic − mass spectrometric analyses confirmed the presence of a tetradecadienyl acetate with mass spectrum and retention index identical to Z,E‐9,11–14Ac. A receptor cell sensitive to both Z,E‐9,11–14Ac and the female extract was identified on the male antenna. An additional receptor cell sensitive to (Z)‐9‐tetradecenyl acetate and (Z,E)‐9,12‐tetradecadienyl acetate was found on the male antenna but was not activated by the female extract. In the field Z,E‐9,11–14Ac presented alone attracted significant numbers of male D. abietella. Addition of (Z)‐9‐tetra‐decenyl acetate inhibited the attraction of males to traps. Phéromone sexuelle de Dioryctria abietella (Lepidoptera: Pyralidae (Phycitinae) L'analyse en chromatographie gazeuse associée à une détection électroantennographique a montré que l'acétate (Z,E)‐9,11‐tétradécadiényle (Z,E‐9,11–14: Ac) est l'un des composants de la phéromone de Dioryctria abietella Schiff (Lepid.: Pyralidae). Couplage chromatographie en phase gazeuse spectrometrie de masse a montré la présence d'acétate tétradécadiényle avec un spectre de masse et un indice de rétention identiques au Z,E‐9,11–14: Ac. Un récepteur cellulaire sensible à la fois au Z,E‐9,11–14: Ac et à un extrait de la femelle a été identifié sous l'antenne du mǎle. Les analyses des antennogrammes et de la cellule isolée ont étayé la caractérisation du composant de la phéromone comme étant Z,E‐9,11–14: Ac. Un récepteur cellulaire additionnel sensible à l'acétate (Z)‐9‐tétradécadécényle et à l'acétate (Z.E.)‐9,12‐tétradécadiényle a été trouvé sur l'antenne du mǎle, mais il n'était pas activé par l'extrait de la femelle. Sur le terrain Z,E‐9,11–14: Ac, présenté seul, attirait des nombres importants de mǎles de D. abietella. L'addition de l'acétate (Z)‐9‐tétradécényle a inhibé l'attraction des mǎles par les pièges. 1983 The Netherlands Entomological Society
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| 4. |
- 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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| 5. |
- Anderbrant, Olle, et al.
(författare)
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Effects of pheromone trap type, position and colour on the catch of the pine sawfly Neodiprion sertifer (Geoff.) (Hym., Diprionidae)
- 1989
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Ingår i: Journal of Applied Entomology. - : Wiley. - 0931-2048 .- 1439-0418. ; 107:1-5, s. 365-369
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Tidskriftsartikel (refereegranskat)abstract
- Two novel easy‐to‐make pheromone traps, a cross‐barrier sticky trap and an open horizontal sticky trap, are described. Both types caught about the same number of male pine sawflies, Neodiprion sertifer, when baited with the synthetic pheromone (2S, 3S, 7S)‐3,7‐dimethylpentadec‐2‐yl acetate. The catch on unbaited cross‐barrier traps was about 17% compared with baited traps, whereas unbaited horizontal traps caught almost no sawflies. There was no difference in catch between horizontal traps positioned close to the stem and at the end of a branch in young Scots pines, but traps on the ground caught less than one tenth of the number caught in traps 1.5 m above ground. The catch in unbaited cross‐barrier traps was dependent on colour, with white being the most attractive. Zur Auswirkung des Pheromonfallentyps, des Aufstellungsorts und der Farbe auf die Fangzahl von Neodiprion sertifer (Geoff.) (Hym., Diprionidae) Es werden zwei neue, einfach herzustellende Pheromonfallentypen, eine Kreuz‐Leimfalle und eine offene, horizontale Leimfalle beschrieben. Mit beiden Fallentypen wurden ungefähr gleich viele männliche Neodiprion sertifer gefangen, wenn die Fallen mit dem synthetischen Pheromon (2S, 3S, 7S)‐3,7‐dimethylpentadec‐2yl‐acetat bestückt waren. Mit den Kreuz‐Leimfallen ohne Pheromon wurden ca. 17 % verglichen mit der Anzahl auf den entsprechenden mit Pheromon bestückten Fallen gefangen. Dagegen wurden mit der Horizontalfalle ohne Pheromon fast keine Blattwespen gefangen. Horizontalfallen, die nahe am Stamm oder am Astende junger Kiefern aufgehängt wurden, unterschieden sich hinsichtlich der Fangleistung nicht. Wurden jedoch die Fallen am Boden aufgestellt, so betrug das Fangergebnis nur noch ca. 1/10 der Fallen, die in 1,5 m Höhe angebracht waren. Die Fangleistung der Fallen ohne Pheromon war abhängig von der Farbe: weiß war die attraktivste Farbe. 1989 Blackwell Verlag GmbH
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| 6. |
- Anderbrant, Olle, et al.
(författare)
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Field Response of Male Pine Sawflies, Neodiprion sertifer (Diprionidae), to Sex Pheromone Analogs in Japan and Sweden
- 2010
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Ingår i: Journal of Chemical Ecology. - : Springer Science and Business Media LLC. - 0098-0331 .- 1573-1561. ; 36:9, s. 969-977
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Tidskriftsartikel (refereegranskat)abstract
- The pine sawfly Neodiprion sertifer (Geoffroy) uses the acetate or propionate of (2S,3S,7S)-3,7-dimethyl-2-pentadecanol (diprionol) as pheromone components, with the (2S,3R,7R)-isomer being antagonistic, synergistic, or inactive according to the population tested. In this study, we tested the attraction of males to the acetates of three analogs of diprionol, each missing one methyl group, viz. (2S,7S)-7-methyl-2-pentadecanol, (2S,6S)-2,6-dimethyl-1-tetradecanol, and (2S,3S)-3-methyl-2-pentadecanol. None of the analogs alone, or in combination with diprionol acetate, was attractive in Sweden, even at 100 times the amount of diprionol acetate attractive to N. sertifer. In Japan, the acetate of (2S,3S)-3-methyl-2-pentadecanol attracted males when tested in amounts 10–20 times higher than the acetate pheromone component. The acetate esters of the (2S,3R)-analog and the (2S,3R,7R)-isomer of diprionol also were tested in combination with the pheromone compound (acetate ester). Both compounds caused an almost total trap-catch reduction in Sweden, whereas in Japan they appear to have relatively little effect on trap capture when added to diprionol acetate. Butyrate and iso-butyrate esters of diprionol were unattractive to N. sertifer in Sweden. In summary, there exists geographic variation in N. sertifer in responses to both diprionyl acetate and some of its analogs.
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| 7. |
- Anderbrant, Olle, et al.
(författare)
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Field response of the pine sawfly Neodiprion sertifer to controlled release of diprionyl acetate, diprionyl propionate and trans-perillenal
- 1992
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Ingår i: Journal of Chemical Ecology. - 0098-0331. ; 18:10, s. 1707-1725
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Tidskriftsartikel (refereegranskat)abstract
- Two dispenser types for pine sawfly (Hymenoptera: Diprionidae) pheromones-glass capillaries and dental cotton rolls-are described, and release rates reported. Glass capillaries of different diameters were used in field tests to determine dose-response relationships of (2 S,3 S,7 S)-3,7-dimethylpentadecan-2-yl acetate (diprionyl acetate), diprionyl propionate, and trans-perillenal on the trap catch of male Neodiprion sertifer. A linear relationship between the logarithm of the capillary cross-sectional area and the logarithm of the release rate was found. However, capillaries of the same diameter could vary in the amount released by as much as a factor of 10. Both the acetate and propionate were attractive alone, but no synergistic effect was found. trans-Perillenal did not show any behavioral activity. Dental cotton rolls have been used extensively in diprionid pheromone research without knowledge about release rates. The release rate from rolls loaded with different amounts of diprionyl acetate was determined by extracting rolls after different times under constant temperature and wind conditions or after use in field tests. Quantification of diprionyl acetate was done on GC. The release rate was found to be proportional to the amount applied over several orders of magnitude, and persisted for several weeks. Capillaries and rolls with similar release rates caught similar numbers of sawflies.
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| 8. |
- Anderbrant, Olle, et al.
(författare)
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Field response of the pine sawfly Neodiprion sertifer to the pheromone (2S, 3S, 7S)‐diprionyl acetate and its stereoisomers
- 1992
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Ingår i: Entomologia Experimentalis et Applicata. - : Wiley. - 0013-8703. ; 62:2, s. 169-181
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Tidskriftsartikel (refereegranskat)abstract
- All eight optical isomers of 3,7‐dimethyl‐2‐pentadecanyl acetate (diprionyl acetate), of high optical purity (>97.4%), were tested for a behavioural activity on male pine sawflies, Neodiprion sertifer (Geoffr.) (Hymenoptera: Diprionidae), in northern Europe. Males were strongly attracted to (2S, 3S, 7S)‐diprionyl acetate. Addition of more than 0.1% of the (2S, 3R, 7R)‐isomer reduced the catch and above 2% the attraction was completely inhibited. Contrary to what has been reported for North American and Japanese populations, so significant synergistic effect of small amounts of the (2S, 3R, 7R)‐isomer could be demonstrated. The effects of addition of the other six optical isomers alone or in combinations, were also studied, but none was found to be a synergist. The (2S, 3R, 7S)‐isomer had a weak inhibitory effect, and completely inhibited the attraction to the (2S, 3S, 7S)‐isomer when applied in about equal amounts as the attractant. In some cases a reduction in catch was noted when other isomers were tested, but this could be attributed to the very small amounts of the inhibitory (2S, 3R, 7R)‐isomer present in these isomers. 1992 The Netherlands Entomological Society
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| 9. |
- Anderbrant, Olle, et al.
(författare)
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Geographic variation in the field response of male European pine sawflies, Neodiprion sertifer , to different pheromone stereoisomers and esters
- 2000
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Ingår i: Entomologia Experimentalis et Applicata. - : Wiley. - 1570-7458 .- 0013-8703. ; 95:3, s. 229-239
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Tidskriftsartikel (refereegranskat)abstract
- The European pine sawfly, Neodiprion sertifer (Geoffroy) (Hymenoptera: Diprionidae), is a widespread and economically important forest insect. The sex pheromone communication system of this species has been previously investigated in North America, Japan and Europe, with the acetate or propionate of the alcohol (2S,3S,7S)-3,7-dimethyl-2-pentadecanol (diprionol) shown to be the main pheromone component. In some locations, male attraction either increased or decreased by the addition of the (2S,3R,7R)-diprionyl acetate isomer. However, these studies were made with different batches of synthetic pheromones, with different types of traps and according to different procedures, so the observed differences might not reflect true geographic variation. Here we investigate the geographic pattern of male sawfly response by using identical chemicals, traps and experimental procedures at eight field sites ranging from Japan in the east to Canada in the west. We found an increased inhibitory effect of the (2S,3R,7R)-isomer from Japan and Siberia to Europe. At the eastern sites, increasing amounts of the (2S,3R,7R)-isomer up to and equal to the amount of the (2S,3S,7S )-isomer, did not influence the trap catch, whereas at sites in Europe, as little as 1% of the (2S,3R,7R)-isomer almost completely inhibited the attraction. The response of the North American population was intermediate. The only site in which the (2S,3R,7R)-isomer was essential for the attraction of males was in Siberia. A similar pattern was found for the (2S,3R,7S)-isomer. Both the acetate and the propionate form of the (2S,3S,7S)-isomer were attractive by themselves in Japan, Europe and North America, and neither the (2S,3R,7S)-isomer nor the (2S,3R,7R)-isomer alone were attractive, in the acetate or propionate form. We discuss the significance of our findings for the development of more efficient monitoring schemes and for the causes of population divergence and speciation in the European pine sawfly.
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| 10. |
- Anderbrant, Olle, et al.
(författare)
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Relation between first and second brood production in the bark beetle Ips typographus (Scolytidae)
- 1988
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Ingår i: Oikos. - : JSTOR. - 0030-1299. ; 53:3, s. 357-365
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Tidskriftsartikel (refereegranskat)abstract
- Results suggest that a single female is equally good at producing a 2nd brood as a pair, and that female density during the 1st oviposition period does not influence the size of the 2nd brood. Female residence time with the 1st brood, body size, weight and lipid content explained little of the large variation in 2nd brood size. -from Authors
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