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  • 1
    Electronic Resource
    Electronic Resource
    Disrupting spring colonization of Colorado potato beetle to nonrotated potato fields (1994)
    Springer
    Entomologia experimentalis et applicata 73 (1994), S. 39-50 
    Details
    ISSN: 1570-7458
    Keywords: Leptinotarsa decemlineata ; Coleoptera ; Chrysomelidae ; distribution ; overwintering ; diapause ; cultural control ; trap cropping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Overwintering Colorado potato beetles (Leptinotarsa decemlineata (Say)) were concentrated primarily within woody borders, and mortality was lower in borders than in potato fields. After overwintering, only 15–44% of live beetles were in the potato fields. In experiments with small plots, colonization of fields from woody borders was reduced ∼60% by a trap crop, either treated with adulticide or with beetles collected daily. Such trap crops, or simply pitfall traps to prevent colonization from woody borders, could significantly reduce early-season adult numbers and subsequent larval populations. However, success is dependent on the local densities of overwintered beetles, and the prevalence of arrestment behavior in the case of trap crops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382512
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of overwintering Colorado potato beetle in and near Massachusetts potato fields (1993)
    Springer
    Entomologia experimentalis et applicata 66 (1993), S. 191-196 
    Details
    ISSN: 1570-7458
    Keywords: Leptinotarsa decemlineata (Say) ; Coleoptera ; Chrysomelidae ; distribution ; diapause ; overwintering ; mortality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382289
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Parametric analysis of the isotope shift and hyperfinestructure in the Eu I configuration 4f 7 5d 6s (1989)
    Springer
    The European physical journal 14 (1989), S. 99-106 
    Details
    ISSN: 1434-6079
    Keywords: 32.20.J ; 35.10.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With doppler-reducedintermodulatedoptogalvanicsaturation laserspectroscopy (IMOGS) in Eu I the isotope shift (IS) and hyperfine structure (hfs) of the remainingb 8 D term of the configuration 4f 7 5d 6s was investigated. With the help of former measurements in our group (a 6,10 D) and by other authors (a 8,10 D) the IS of the now complete configuration (20 levels) was analysed with wavefunctions by J.-F. Wyart. From the parametric description of the IS resulted the necessity also to include the often neglected small parameterg 1(g 1(4f, 5d)=9.3(3) MHz), which is mainly due to the specific mass shift. The IS of all 20 levels can be well described by further crossed-second-order parametersg 2(5d, 6s)=−401(5) MHz andg 3(4f, 6s)=−27(1) MHz and one commonJ-dependent parameterz 5d =40.4(4.1) MHz. — With effective one-electron parametersa kl ,b kl an interpretation of the magnetic and electric hfs (except for a few disturbed levels) could also be carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01399029
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    Paper (German National Licenses)
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