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  • 1
    Electronic Resource
    Electronic Resource
    Population dynamics of the whitefly,Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae), in Java, Indonesia, with special reference to spatio-temporal changes in the quantity of food resources (1995)
    Springer
    Ecological research 10 (1995), S. 75-85 
    Details
    ISSN: 1440-1703
    Keywords: Bemisia tabaci ; food resource ; interpatch movement ; population dynamics ; regulatory process
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six monitoring plots were established in the northern part of West Java, Indonesia, to clarify the factors that influence population fluctuations of the whitefly,Bemisia tabaci. Yellow sticky traps were used to monitor adult populations. To examine the relationship between the population fluctuations and the quantity of food resources, the quantity of food resources ofB. tabaci (i.e. soybean and mung bean) was also investigated routinely in each subdistrict where the experimental plot was located. The maximum number of adults per trap in each sowing season showed a similar noticeable seasonal trend in all experimental plots. Climatic factors did not have a major role to play in population fluctuations. The number of adults per trap in each experimental plot tended to increase when the quantity of food resources in each subdistrict increased. The changes of the quantity of food resources seemed to influence the population fluctuations. It is suggested that the operation of regulatory processes in population density is influenced largely by both the distance between habitat patches and the amplitude of temporal fluctuations of the quantity of food resources. An explanation for why the time lag between fluctuations of the quantity of food resources and the number of individuals ofB. tabaci occurred is discussed. Based on their flight ability and intrinsic rate of natural increase,B. tabaci is considered not to be a serious pest in the environment where the host plants are grown discontinuously in time and space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347657
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Parasitic Wasp, Dinarmus basalis, Utilizes Oviposition-marking Pheromone of Host Azuki Bean Weevils As Host-Recognizing Kairomone (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 2677-2695 
    Details
    ISSN: 1573-1561
    Keywords: Parasitic wasp ; Dinarmus basalis ; kairomone ; host recognition ; azuki bean weevil ; Vigna angularis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A host-recognizing kairomone responsible for the stinging behavior of the parasitic wasp, Dinarmus basalis, was studied. Fresh azuki beans coated with an acetone extract of the azuki beans, from which both emerged wasps and their host weevils were removed, elicited stinging behavior from female wasps. The kairomone is a mixture of saturated hydrocarbons and diacylglycerols, both of which are required for activity. The kairomone is composed of normal and methyl-branched hydrocarbons with carbon numbers ranging from 25 to 35, most of which are known as the hydrocarbon constituents of an oviposition-marking pheromone of the host azuki bean weevils, Callosobruchus chinensis. This indicates that D. basalis utilizes the oviposition-marking pheromone of its host weevils as a host-recognizing kairomone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026425407150
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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