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    An investigation into the possibility of reversion towards susceptibility in a N.Z. insecticidal strain of Tetranychus urticae Koch: a dissertation submitted in partial fulfilment of the requirement for the degree of Bachelor of Horticultural Science with Honours in the University of Canterbury [Lincoln College]

    Ong, K. H.
    Abstract
    The wide occurrence of resistance to insecticides in many pest species is a prime example of rapid evolution or what is termed microevolution in the Darwinian sense (Brown, 1967). This process embraces the principles of mutation, migration and selection. As a matter of survival, pest insect species have begun a passive retaliation. In resistance, the population gene pool is being dealt with. Insecticides act as powerful “sieves”, selecting out the few pre-adapted resistant individuals within the population (Plapp, 1970) and eventually concentrating these resistant mutants (Crow, 1957) that were initially low in frequency within the population. Thus the rate of acquirement, but not mere possession of resistance depends on the recessiveness or dominance of the resistant genes. Given adequate pressure to spark off this evolutionary change, nearly all insect species are capable of developing some form of tolerance to a particular insecticide (Georghiou, 1972).... [Show full abstract]
    Keywords
    mites; insecticide; resistance management; Tetranychus urticae; reversion of insecticide resistance
    Fields of Research
    0706 Horticultural Production; 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
    Date
    1974
    Type
    Dissertation
    Access Rights
    Digital thesis can be viewed by current staff and students of Lincoln University only. If you are the author of this item, please contact us if you wish to discuss making the full text publicly available.
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