| 11. |
- Anderbrant, O., et al.
(författare)
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Intraspecific competition affecting parents and offspring in the bark beetle Ips typographus.
- 1985
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Ingår i: Oikos. - : JSTOR. - 0030-1299. ; 45:1, s. 89-98
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Tidskriftsartikel (refereegranskat)abstract
- Parents re-emerged sooner at higher densities but the total proportion that re-emerged was independent of density. Over 20 offspring per female were produced at the lowest density (0.5/100 cm2) but only 0.6 per female at the highest density (31/100 cm2). Offspring from the lowest density were about 50% heavier than those from the highest density and also the fat content increased with decreasing density. Females weighed less and contained less fat than males. Male offspring from lower densities produced larger amounts of the pheromone components cis-verbenol and 2-methyl-3-buten-2-ol than males from the higher densities. Offspring from the highest density produced about half as many progeny as those from the lowest densities, showing an effect of density acting over more than one generation. Density-induced variation of beetle 'quality' might be of importance in the population dynamics of bark beetles.-from Authors
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| 12. |
- Anderbrant, Olle, et al.
(författare)
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Odour signals for detection and control of indoor pyralid moths
- 2009
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Ingår i: IOBC/WPRS Bulletin. - 1027-3115. ; 41, s. 69-74
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Tidskriftsartikel (refereegranskat)abstract
- Three pyralid moths, the Mediterranean flour moth (Ephestia kuehniella), the almond moth (Ephestia cautella) and the Indian meal moth (Plodia interpunctella), infest food products all over the world and cause severe problems in factories, shops and households. For health and environmentalreasons chemical control becomes more and more restricted. We here present some promising results offering efficient detection and control of these species based on semiochemicals, and line up a number of remaining questions to be answered in order to improve the reliability and competitiveness of the methods used. For P. interpunctella and E. cautella we found that more complex pheromone blends were superior to the commercially available one-component blend in attracting males, andshould be used if increased sensitivity is desired. The almond moth, males as well as females, can be trapped in buckets with tap water, which will give an estimate of the population level without use of pheromone traps. All three species show positive response to odours identified from chocolate, and this could possibly be developed further and used to determine relative population densities. For population suppression the pheromone-mediated mating disruption technique was employed inlocalities with infestations of all three species. Based on several indirect methods to estimate the population densities we conclude that this technique has a large potential for controlling all three mothspecies.
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| 13. |
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| 14. |
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| 15. |
- Anderbrant, O.
(författare)
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Weather factors influencing catch of Neodiprion sertifer (Hymenoptera : Diprionidae) in pheromone traps
- 1993
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Ingår i: Environmental Entomology. - : Oxford University Press (OUP). - 0046-225X .- 1938-2936. ; 22:2, s. 445-452
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Tidskriftsartikel (refereegranskat)abstract
- Variation in number of European pine sawflies Neodiprion sertifer caught in pheromone traps during 11 d of the peak flight period was in part explained by weather. Daily average air temperature was the most important variable and explained 86% of the variation. A threshold for flight was c+11°C. Rain during most of the day inhibited flight, but occasional showers did not. -from Authors
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| 16. |
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| 17. |
- Faraone, N., et al.
(författare)
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Attraction of the larval parasitoid Spintherus dubius (Hymenoptera : Pteromalidae) to feces volatiles from the adult apion weevil host
- 2017
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Ingår i: Journal of Insect Behavior. - : Springer Science and Business Media LLC. - 0892-7553 .- 1572-8889. ; 30:1, s. 119-129
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Tidskriftsartikel (refereegranskat)abstract
- The behavioral response of the larval parasitoid Spintherus dubius (Hymenoptera: Pteromalidae) to volatile compounds derived from its Apion weevil hosts was investigated in two-choice bioassays. Odor source candidates were the larval and adult stages of weevils, clover flowers, and feces from adult weevils. Despite S. dubius being a larval parasitoid, the odor of weevil larvae isolated from the clover flowers was not attractive to female parasitoids. Surprisingly, S. dubius females were instead attracted by the odor from the feces of adult weevils. The female parasitoids were similarly attracted to the feces produced by the two main hosts, the red clover weevil (A. trifolii) and the white clover weevil (A. fulvipes). Chemical analysis of the volatile composition of feces produced by the two hosts revealed qualitatively similar odor profiles, correlating with the observed attraction by the parasitoid towards both odor sources. Some of the identified volatile compounds are commonly present in clover plant headspace fractions and may function as a kairomone to facilitate orientation by S. dubius to Apion-infested clover flowers. Larval and adult weevils were not attractive for parasitoid females, whereas, for the white clover weevil-plant association, infested flowers were highly attractive. These data show the use by the clover weevil parasitoid of an alternative source of olfactory information for locating its host.
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| 18. |
- Frago, Enric, et al.
(författare)
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Common pheromone use among host-associated populations of the browntail moth, euproctis chrysorrhoea, displaying different adult phenologies
- 2019
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Ingår i: Entomologia Generalis. - : Schweizerbart. - 0171-8177. ; 39:3-4, s. 295-306
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Tidskriftsartikel (refereegranskat)abstract
- The diversity of herbivorous insects may arise from colonization and subsequent specialization on different host plants. Such specialization requires changes in several insect traits, which may lead to host race formation if they reduce gene flow among populations that feed on different plants. Behavioural changes may play a relevant role in host race formation, for example if different races evolve distinct sexual communication signals or adult phenology. Previous research has revealed differences in larval phenology in different host-associated populations of the browntail moth, Euproctis chrysorrhoea (Lepidoptera: Erebidae). Here, sex pheromones among populations of this species are compared, and pheromone trapping data obtained is used in the field to build a phenological model that tests whether populations that feed on different plants differ in their adult flight period. The chemical and electrophysiological analyses revealed that two E. chrysorrhoea populations (on Prunus and on Arbutus unedo) use the same sex pheromone component for mate finding. Our trapping data, however, showed that males fly on average 25 days earlier in populations whose larvae feed on A. unedo compared to those whose larvae feed on Quercus species. Although the shifted phenology described here may underlie host-plant specialization in E. chrysorrhoea, and adults of this species are short-lived, the use of a common sexual pheromone and a large overlap in flight periods suggest that host race formation via allochronic isolation is unlikely in this moth.
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| 19. |
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