Research@Lincoln
    • Login
     
    View Item 
    •   Research@Lincoln Home
    • Theses and Dissertations
    • Theses and Dissertations with Restricted Access
    • View Item
    •   Research@Lincoln Home
    • Theses and Dissertations
    • Theses and Dissertations with Restricted Access
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    A development of a sampling plan for a study of population dynamics of Tuberculoides annulatus Hartig and some aspects of its biology

    Rohitha, B. H.
    Abstract
    Very little work has been done on arboreal aphids. Available literature on arboreal sampling of insects and studies on biological properties of aphids have been reviewed. The thesis develops a sampling plan for a population dynamics study of T. annulatus and reveals some aspects of its biology. Selection of the best sampling unit out of clusters and branch tips is described. Timing of sampling, sampling sites, procedures and summary tables of the analyses of variance are given. Occurrence of Myzocallis castanicola Baker in the final sampling is included and an optimum sampling plan has been derived. Ten percent standard error of mean is shown to be an impracticable precision for some stages sampled (especially natural enemies), so a precision of 21% standard error is accepted to be satisfactory for a study of population dynamics of T. annulatus. The necessity to restrict sampling to one site (out of the two studied sites) on basis of precision is discussed. Several transformations have been tried to select the best fit for selected data. Taylor's power law was the most appropriate transformation. (A FORTRAN computer programme, available for reference at the Department of Entomology, Lincoln College was designed to assist in evaluating the transformation functions based on Taylor's power law.) Rearing chambers for T. annulatus have been described. Some observations leading to a concept of two, coloured biotypes, in T. annulatus have been discussed. Feeding behaviour of T. annulatus on the lower epidermis is analysed. The most effective factor driving the aphids to the lower surface is the aphids’ special affinity to lower epidermis. A modified form of the usual disc technique to study biology of aphids is given. Results obtained on the life history and marked differences in biology of the two colour forms grown on the leaf discs have been discussed. A study of the growth pattern in one colour biotype of T. annulatus from birth to adult is discussed. A major fluctuation in the breadth, length and weight in the fourth instar is recorded and is accounted for. Correlations between the breadth, length and the weight of instars have been indicated. The effects of mechanical handling incurred in the proceeding study was analysed and were observed to slow down the rate of development in T. annulatus.... [Show full abstract]
    Keywords
    population dynamics; Tuberculoides annulatus (Hartig); insect biology; aphids; life cycle; growth patterns; transformation; New Zealand
    Fields of Research
    060207 Population Ecology; 060808 Invertebrate Biology; 060603 Animal Physiology - Systems
    Date
    1976
    Type
    Thesis
    Access Rights
    Digital thesis can be viewed by current staff and students of Lincoln University only. Print copy available for reading in Lincoln University Library.
    Collections
    • Department of Pest Management and Conservation [646]
    • Theses and Dissertations with Restricted Access [2207]
    Share this

    on Twitter on Facebook on LinkedIn on Reddit on Tumblr by Email

    View/Open
    Staff/student login to read
    Metadata
     Expand record
    This service is managed by Learning, Teaching and Library
    • Archive Policy
    • Copyright and Reuse
    • Deposit Guidelines and FAQ
    • Contact Us
     

     

    Browse

    All of Research@LincolnCommunities & CollectionsTitlesAuthorsKeywordsBy Issue DateThis CollectionTitlesAuthorsKeywordsBy Issue Date

    My Account

    LoginRegister

    Statistics

    View Usage Statistics
    This service is managed by Learning, Teaching and Library
    • Archive Policy
    • Copyright and Reuse
    • Deposit Guidelines and FAQ
    • Contact Us