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  • 1995-1999  (2)
  • Chemoreceptors  (1)
  • European red mite (Panonychus ulmi)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Phenotypic plasticity in numbers of antennal chemoreceptors in a grasshopper: effects of food (1998)
    Springer
    Journal of comparative physiology 183 (1998), S. 69-76 
    Details
    ISSN: 1432-1351
    Keywords: Key words Phenotypic plasticity ; Chemoreceptors ; Antenna ; Grasshopper ; Salicin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Grasshoppers, Schistocerca americana, reared from hatching on artificial diet had fewer sensilla on the antennae in the final larval stage than insects reared on lettuce. This was true of basiconic and coeloconic sensilla (presumed olfactory) and trichoid sensilla (presumed gustatory). The degree of difference varied along the antenna and with sensillum type. Adding salicin to the diet restored the numbers of all types of sensillum to levels equal to, or approaching, those in lettuce-fed insects. The addition of some volatile compounds – carvone (monoterpene), chalcone (flavonoid), citral (monoterpene) and guaiacol (phenolic) – resulted in slight increases in number, but coumarin (phenylpropanoid) had no effect. None of the compounds, either singly or in combination, produced more sensilla than were present in plant-fed insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050235
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The use of image analysis to study the effects of residues of esfenvalerate on the locomotory behaviour of Panonychus ulmi and Typhlodromus pyri (Acari: Tetranychidae, Phytoseiidae) (1999)
    Springer
    Experimental and applied acarology 23 (1999), S. 1-9 
    Details
    ISSN: 1572-9702
    Keywords: Image analysis ; locomotory behaviour ; European red mite (Panonychus ulmi) ; Typhlodromus pyri ; esfenvalerate.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influences of esfenvalerate on mite behaviour were investigated by image analysis. Video recordings of the locomotory behaviour of two mite species were converted into a series of x,y coordinates that, when joined, closely resembled their paths. These coordinates were used to calculate walking speed, direction of travel, turning frequency, turn bias and tortuosity. Two experimental arenas were used: (1) a leaf disc arena for the European red mite, Panonychus ulmi and (2) a glass coverslip arena for Typhlodromus pyri. The behavioural responses of P. ulmi and T. pyri to esfenvalerate (field rate) indicated that these mites did not show a preference for the unsprayed halves of the arenas during the first 48 min. However, significant differences between most of the behavioural parameters to esfenvalerate residues were found with P. ulmi when whole arenas were compared. © Rapid Science Ltd. 1998
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006140509101
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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