• Login
    View Item 
    •   Home
    • Massey Documents by Type
    • Theses and Dissertations
    • View Item
    •   Home
    • Massey Documents by Type
    • Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Graphania mutans (Walker) and Acremonium lolii (Latch) : the relationship between an insect herbivore and a fungal endophyte of perennial ryegrass : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Zoology at Massey University

    Icon
    View/Open Full Text
    01_front.pdf (811.3Kb)
    02_whole.pdf (10.99Mb)
    Export to EndNote
    Abstract
    In examining the relationship between Graphania mutans (Walker) (Lepidoptera: Noctuidae) and perennial ryegrass infected with the fungal endophyte Acremonium lolii (Latch in press), the biology of G. mutans was investigated. Two types of larval development are identified: 'fast-track' larvae develop more rapidly through fewer instars and grow much larger than 'slow-track' larvae when reared on both artificial diet and perennial ryegrass. The complexity of Graphania speciation is discussed. The presence of endophyte is shown to confer on perennial ryegrass resistance to G. mutans larvae in the laboratory, with strong antixenosis and possible antibiosis effects exhibited. Feeding preference tests show that neonate and sixth instar fast-track larvae significantly prefer excised endophyte-free ryegrass to endophyte-infected leaves. The effects of endophyte on the development of fast-track and slow-track larvae are to decrease larval weight, head capsule width, and the number of successful pupations. The same methods were used to determine the effects of peramine (an antifeedant compound for Argentine stem weevil extracted from endophyte-infected perennial ryegrass) on fast-track G. mutans larvae. Incorporated into artificial diet at 10ppm, peramine has no affect on neonate and sixth instar larval feeding preference. peramine does affect larval development, causing reduced larval weight, delayed pupation, and, increased mortality. The role of peramine in endophyte-induced resistance, and the possible adaptive significance for perennial ryegrass of endophyte infection is considered. The interactions between G. mutans, endophyte and perennial ryegrass within the pasture ecosystem are discussed, and suggestions and hypotheses presented for future investigation.
    Date
    1987
    Author
    McGee, Ian Robert
    Rights
    The Author
    Publisher
    Massey University
    URI
    http://hdl.handle.net/10179/10638
    Collections
    • Theses and Dissertations
    Metadata
    Show full item record

    Copyright © Massey University
    Contact Us | Send Feedback | Copyright Take Down Request | Massey University Privacy Statement
    DSpace software copyright © Duraspace
    v5.7-2020.1
     

     

    Tweets by @Massey_Research
    Information PagesContent PolicyDepositing content to MROCopyright and Access InformationDeposit LicenseDeposit License SummaryTheses FAQFile FormatsDoctoral Thesis Deposit

    Browse

    All of MROCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Copyright © Massey University
    Contact Us | Send Feedback | Copyright Take Down Request | Massey University Privacy Statement
    DSpace software copyright © Duraspace
    v5.7-2020.1