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  • 1
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    Predicting the outcome of potential novel associations: interactions between the invasive Vincetoxicum rossicum and native western Chrysochus beetles (2019)
    Springer
    Details
    Publication Date: 2019-06-28
    Print ISSN: 1387-3547
    Electronic ISSN: 1573-1464
    Topics: Biology
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of host diet on acceptance of eastern spruce budworm eggs by Trichogramma minutum (1997)
    Springer
    Entomologia experimentalis et applicata 84 (1997), S. 41-47 
    Details
    ISSN: 1570-7458
    Keywords: egg parasitoid ; host acceptance ; preference ; Trichogramma minutum/ ; Choristoneura fumiferana/ ; Abies balsamea/ ; biological control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The acceptance behaviour of the parasitic wasp, Trichogramma minutum Riley (Hymenoptera: Trichogrammatidae), was studied on two types of egg masses of eastern spruce budworm (SBW), Choristoneura fumiferana Clemens. Host eggs were obtained from moths that had been fed balsam fir or artificial diet during their larval stages. Parasitoids were reared from both types of hosts. Host acceptance assays were conducted where females were provided with a single egg mass and with a choice between egg masses. Regardless of the parasitoid's rearing host, females parasitised hosts reared from artificial diet more often than those from balsam fir. Response was consistent in both no-choice and choice assays. Rejection of hosts tended to occur during the examining stage of behaviour, suggesting that acceptability is judged externally. If a host was accepted, the same number of eggs were laid per egg mass regardless of treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003044813827
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of environmental conditions and parasitoid quality on field performance of Trichogramma minutum (1996)
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 461-468 
    Details
    ISSN: 1570-7458
    Keywords: Trichogramma minutum ; Choristoneura fumiferana ; Ephestia kuehniella ; biological control ; inundative release ; weather ; host acceptance ; realized fecundity ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of weather conditions and two parasitoid quality attributes, realized fecundity and host acceptance, were assessed on the field efficacy of mass-released Trichogramma minutum. Temperature was the most important single variable, explaining up to 75% of the variation in field parasitism. There were significant positive relationships between both the sum of the maximum temperatures and the number of degree-hours above a 15 °C threshold, accumulated in the three days following the release, and parasitism in the field. There was a significant negative relationship between the mean relative humidity and the odds of parasitism in the field. Quality parameters based on parasitoid biology were not effective for predicting field efficacy if poor weather conditions persisted after a release. If weather conditions were ‘good’ (i.e. accumulated maximum temperatures above 62 °C, in the 3 days following the release), then parameters such as release rate and fecundity in the lab were useful predictors of field performance. There was no relationship between host acceptance measured in the lab and field parasitism. Given the importance of field temperatures for field performance, selection for cold tolerance of T. minutum would be desirable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343469
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  • 4
    Electronic Resource
    Electronic Resource
    Flight initiation in the egg parasitoid Trichogramma minutum: Effects of ambient temperature, mates, food, and host eggs (1992)
    Springer
    Entomologia experimentalis et applicata 62 (1992), S. 147-154 
    Details
    ISSN: 1570-7458
    Keywords: Flight ; emergence ; egg parasitoid ; Trichogramma minutum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Emergence, preening, and flight initiation were studied in laboratory-reared Trichogramma minutum Riley (Hymenoptera: Trichogrammatidae). Male parasitoids emerged first and flew before females. When both sexes were present in flight cylinders, female parasitoids flew before males. Flight propensity in males was negatively related to the number of emerging females, while flight propensity in females was independent of the number of males present. Ambient temperature significantly affected the propensity and timing of flight; between 70–80% of the parasitoids flew at 25 and 30 °C while less than 4%, mostly males, flew at 20 °C. No flights were observed at 15 °C. The presence of fresh host eggs caused a reduction in the proportion of female parasitoids that flew and a delay in the time to flight for the females that did fly. The presence of food increased the flight propensity of female parasitoids, but did not affect the timing of flight. The relationship between flight behaviour and the ‘efficiency’ of mass-reared Trichogramma is discussed in terms of its importance for inundative release programmes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345486
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