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  • 1
    Electronic Resource
    Electronic Resource
    Ecological and Evolutionary Interactions between Wild Crucifers and Their Herbivorous Insects (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Plant species biology 9 (1994), S. 0 
    Details
    ISSN: 1442-1984
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Insects feeding on ten species of wild crucifer were investigated. Differences in host plant range and insect community structure were examined with regard to anti-herbivore defense mechanisms. Most of the crucifer species deterred insect herbivory by disappearing in the summer or by lowering their intrinsic quality as food for insects. Species with these defense mechanisms were exploited by only a few specialized herbivorous insects that seemed to have counter defenses. The plants without these defense mechanisms were used by many herbivorous insect species. Rorippa indica lacked direct defenses, but supported a low total density of herbivore individuals. This crucifer has an indirect defense mechanism: ants attracted to floral nectar defended the plant from deleterious herbivores. Crucifers that disappeared seasonally lacked other anti-herbivore defense mechanisms. This suggests that the phonological response is an alternative other responses to herbivore attack.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1442-1984.1994.tb00094.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Oviposition experience on a host-infested plant affects flight and antennal searching behavior of Cotesia kariyai toward the host-plant complex (2000)
    Springer
    Entomologia experimentalis et applicata 97 (2000), S. 251-256 
    Details
    ISSN: 1570-7458
    Keywords: Cotesia kariyai ; Mythimna separata ; host-plant complex ; oviposition experience ; learning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The flight response of Cotesia kariyaiWatanabe (Hymenoptera: Braconidae), a parasitoid of the polyphagous herbivore, Mythimna separataWalker (Lepidoptera: Noctuidae), to pairs of different plant species infested by M. separatalarvae was tested under a dual choice condition in the laboratory. The oviposition-inexperienced (naive) wasps showed preference in the order: corn 〉 kidney bean 〉 Japanese radish. Wasps that had previously oviposited on the less preferred plant in a pair were found to have shifted their preference to this plant at 2 h after oviposition. However, this shift became indistinct at 17 h after oviposition. Prior oviposition on a plant species other than those being compared also affected the preference. These data suggest that learning is involved in the wasp's flight response. Prior oviposition was also observed to have an effect on the antennal searching behavior of the wasp on corn leaves. Such behavioral plasticity may enhance the efficiency by which C. kariyaisearches for polyphagous hosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004026610315
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Factors determining the host plant range of the phytophagous mite, Tetranychus urticae (Acari: Tetranychidae): a method for quantifying host plant acceptance (1998)
    Springer
    Experimental and applied acarology 22 (1998), S. 595-601 
    Details
    ISSN: 1572-9702
    Keywords: Tetranychus urticae ; host plant range ; host plant acceptance ; host plant suitability ; potential host plant ; Tetranychidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The host plant acceptance of the phytophagous mite Tetranychus urticae was experimentally quantified. Host plant acceptance is described as the proportion of adult females settling on the test plant on which they have been placed. On the other hand, the host plant suitability of T. urticae on different plant species is expressed as the mean number of eggs produced by the females within 5 days (hereafter 'fecundity'). An inbred T. urticae line was tested with regard to host plant acceptance and fecundity on 11 potential host plants. These two variables were positively correlated across host plants; host plant species on which the fecundity was low were also those on which females settled less readily compared to host plants with high fecundity. The characteristics of host plant acceptance of the T. urticae are discussed in light of their potential food resource under natural conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006138527904
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cotesia glomerata Female Wasps Use Fatty Acids from Plant–Herbivore Complex in Host Searching (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 1505-1515 
    Details
    ISSN: 1573-1561
    Keywords: Cotesia glomerata ; Pieris rapae ; Rorippa indica ; plant–herbivore complex ; palmitic acid ; oleic acid ; stearic acid ; tritrophic interaction ; antennation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Cotesia glomerata parasitizes early instars of the cabbage butterfly,Pieris rapae, in Japan. Female wasps antennatedRorippa indica leaves damaged by feeding ofP. rapae larva, but ignored artificially damaged leaves. Females also antennated filter paper containingR. indica leaf juice plusP. rapae regurgitant. Chemical analysis revealed five compounds in higher amounts in the infested edges of leaves than in artificially damaged edges. Among them, we identified palmitic acid, oleic acid, and stearic acid. Female wasps antennated filter paper containing each of these three acids. We discuss the function of these acids in the tritrophic context.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006418.49537.5d
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Light on the Tritrophic Interaction Between Kidney Bean Plants, Two-Spotted Spider Mites and Predatory Mites, Amblyseius Womersleyi (Acari: Phytoseiidae) (2000)
    Springer
    Experimental and applied acarology 24 (2000), S. 415-425 
    Details
    ISSN: 1572-9702
    Keywords: Amblyseius womersleyi ; Tetranychus urticae ; kidney bean plant ; herbivore-induced plant volatiles ; oviposition rate ; predation rate ; dispersal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract By analyzing the volatiles from Tetranychus urticae-infested kidney bean plants (Phaseolus vulgaris) at different times for two days, we found that they were mainly produced in the light. Tetranychus urticae showed a higher oviposition rate and spent more time feeding during the day (in the light) than at night (in the dark). Infested leaves placed in the light attracted the predatory mite Amblyseius womersleyi, whereas those that were placed in the dark for at least 2 h in daytime did not. This indicates that presence or absence of light affects the production of herbivore-induced plant volatiles. Amblyseius womersleyi dispersed more frequently and consumed more T. urticae eggs during the day (in the light) than at night (in the dark), whereas their oviposition rate did not differ between day and night. Presence or absence of herbivore-induced plant volatiles in the surroundings did not affect dispersal, predation or oviposition rates of A. womersleyi. These results show that A. womersleyi’s behavior coincides with the production pattern of herbivore-induced plant volatiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006449108245
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    Paper (German National Licenses)
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