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  • Halotydeus destructor  (2)
  • Springer  (2)
  • American Geophysical Union (AGU)
  • Nature Publishing Group
  • 2000-2004  (2)
  • 1975-1979
  • 1
    Electronic Resource
    Electronic Resource
    Cold storage of Halotydeus destructor (Acari: Penthaleidae) for use in experiments (2000)
    Springer
    Experimental and applied acarology 24 (2000), S. 123-133 
    Details
    ISSN: 1572-9702
    Keywords: redlegged earth mite ; Halotydeus destructor ; cold storage ; low temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Survival of medium sized nymphal stages of redlegged earth mite Halotydeus destructor (Tucker) (mainly tritonymphs and deutonymphs) stored under low temperature (1.5° C) in sealed plastic boxes remained more than 50% after 12 days of storage, with some mites surviving for up to eight weeks. Adding fresh subclover leaves into the storage box increased the survival rate of mites from 12% to 28%, 19 days after the storage started. Mites stored for two weeks at low temperatures showed feeding activity in a screening experiment similar to mites collected directly from the field. This indicated that cold storage of redlegged earth mite can be used to build up mite numbers for large screening experiments, or to extend the period of availability of mites collected from the field. However, their reproductive ability was greatly reduced after three weeks at low temperature. Thus, care should be taken when using mites for experiments measuring reproduction. The implications of low temperatures for reducing field populations of mites in midwinter are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006454621228
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  • 2
    Electronic Resource
    Electronic Resource
    Role of Alkaloids in Resistance of Yellow Lupin to Red-Legged Earth Mite Halotydeus destructor (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 429-441 
    Details
    ISSN: 1573-1561
    Keywords: Lupinus luteus ; Halotydeus destructor ; plant resistance ; deterrent activity ; quinolizidine alkaloids ; ammodendrine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Eleven varieties of Lupinus luteus were tested in choice and no-choice experiments for their resistance to feeding by the red-legged earth mite (Halotydeus destructor). Three were found to show resistance, and the alkaloid fraction from these varieties strongly deterred mites from feeding. The alkaloid components of the extracts, lupinine, a number of acyl derivatives of lupinine, and sparteine were tested for deterrent activity. Sparteine was the most potent, with significant activity at 0.001% concentration. Quantitation of the levels of nonpolar alkaloids in the cotyledons and leaves of the 11 varieties was by gas chromatography–mass spectrometry. An inverse correlation was found between the concentrations of these alkaloids and the damage caused by the mites; varieties with levels 〈100 μg/g (fresh wt) showed a high damage index. The involvement of sparteine and the bipiperidine alkaloid ammodendrine in the deterrence to mite feeding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005413606680
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    Paper (German National Licenses)
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