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  • 1
    Electronic Resource
    Electronic Resource
    Effects of genetic and environmental host plant variation on the susceptibility of two noctuids toBacillus thuringiensis (1994)
    Springer
    Entomologia experimentalis et applicata 70 (1994), S. 165-178 
    Details
    ISSN: 1570-7458
    Keywords: Bacillus thuringiensis ; host plant resistance ; seasonal variation ; Spodoptera exigua ; Trichoplusia ni
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract TwoApium graveolens var.rapaceum (L.) cultivars that differ in their suitability for the survival and growth ofSpodoptera exigua (Hübner) andTrichoplusia ni (Hübner) were used to examine the effect of genetic and seasonal environmental variation in host plant suitability on the efficacy ofBacillus thuringiensis subsp.kurstaki (Berliner). The effects of host plant genotype andB. thuringiensis were generally independent, so thatB. thuringiensis efficacy was greatest on the resistant host plant cultivar. Host plant suitability varied within growing season for both insect species but, while host plant suitability decreased with increasing plant age forT. ni, the response ofS. exigua to plant age was not as clear. Within season variation in host plant suitability affectedB. thuringiensis efficacy and the interaction betweenB. thuringiensis and host plant cultivar forS. exigua but not forT. ni. Soluble protein and Folin-Denis phenolic concentrations of host plant tissue were not correlated with changes in host plant suitability to either insect species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380524
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phthalide-based host-plant resistance toSpodoptera exigua andTrichoplusia ni inApium graveolens (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 709-726 
    Details
    ISSN: 1573-1561
    Keywords: Host-plant resistance ; phthalide ; sedanenolide ; celeriac ; Bacillus thuringiensis ; tritrophic interaction ; beet armyworm ; cabbage looper ; Apium graveolens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A chemical basis for the difference in suitability between two celeriac (Apium graveolens var.rapaceum) cultivars for the survival and growth ofSpodoptera exigua (Hübner) andTrichoplusia ni (Hübner) was identified as sedanenolide (3-n-butyl-4,5-dihydro-isobenzofuranone). Sedanenolide was isolated using a bioassay-driven extraction and purification procedure and was identified using several spectrometric methods. Foliar concentrations of sedanenolide were negatively correlated with larval performance and were significantly higher in the cultivar less suitable for larval survival and growth. Sedanenolide andBacillus thuringiensis Berliner acted additively in reducing larval growth when combined in artificial diets, a result that is consistent with previous studies in which the combined effect of host plant cultivar andB. thuringiensis on larval survival and growth were additive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059608
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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