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Comostolopsis Germana</Em> (Bitou Tip Moth)

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Comostolopsis Germana</Em> (Bitou Tip Moth) University of Wollongong Research Online University of Wollongong Thesis Collection 2017+ University of Wollongong Thesis Collections 2017 The efficacy of the biological control agents Comostolopsis germana (Bitou Tip Moth) and Mesoclanis polana (Bitou Tip Fly) in controlling the invasive weed Chrysanthemoides monilifera spp. rotundata (Bitou Bush) Kim Lynda Barrett UnivFollowersity this of and Wollongong additional works at: https://ro.uow.edu.au/theses1 University of Wollongong Copyright Warning You may print or download ONE copy of this document for the purpose of your own research or study. The University does not authorise you to copy, communicate or otherwise make available electronically to any other person any copyright material contained on this site. You are reminded of the following: This work is copyright. Apart from any use permitted under the Copyright Act 1968, no part of this work may be reproduced by any process, nor may any other exclusive right be exercised, without the permission of the author. Copyright owners are entitled to take legal action against persons who infringe their copyright. A reproduction of material that is protected by copyright may be a copyright infringement. A court may impose penalties and award damages in relation to offences and infringements relating to copyright material. Higher penalties may apply, and higher damages may be awarded, for offences and infringements involving the conversion of material into digital or electronic form. Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong. Recommended Citation Barrett, Kim Lynda, The efficacy of the biological control agents Comostolopsis germana (Bitou Tip Moth) and Mesoclanis polana (Bitou Tip Fly) in controlling the invasive weed Chrysanthemoides monilifera spp. rotundata (Bitou Bush), Master of Science (Research) thesis, School of Biological Sciences, University of Wollongong, 2017. https://ro.uow.edu.au/theses1/32 Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] School of Biological Sciences The efficacy of the biological control agents Comostolopsis germana (Bitou Tip Moth) and Mesoclanis polana (Bitou Tip Fly) in controlling the invasive weed Chrysanthemoides monilifera spp. rotundata (Bitou Bush) Kim Lynda Barrett May 2017 DECLARATION This thesis is submitted in accordance with the regulations of the University of Wollongong in partial fulfilment of Master of Science (Research). It does not contain any material published by another person except where due reference is made in the text. I declare the work contained in this document is original and has not been submitted for any other degree or award. Kim Lynda Barrett ABSTRACT Biological control (biocontrol) is commonly used in Australia and generally considered to be a successful cost effective method to regulate invasive weeds. Post-release research to measure an agent’s effectiveness enables weed mangers to fine tune biological programs strategies and alter other management options, however there is limited research reporting on this type of rigorous assessment. This study seeks to quantify the efficacy of two biocontrol agents on the invasive weed Chrysanthemoides monilifera subsp. rotundata (Bitou Bush). Comostolopsis germana (Bitou Tip Moth) and Mesoclanis polana (Bitou Seed Fly) are two established agents released to control C. m. spp. rotundata. Specifically, I asked: 1. What is the distribution of C. germana? 2. What are the current damage levels of C. m. subsp. rotundata tips by C. germana? 3. Is there a difference in damage levels by C. germana between the fore-dune and the hind-dune? 4. What are the damage levels for C. m. subsp. rotundata seeds by M. polana? 5. Is there is difference in damage levels by M. polana between the fore-dune and the hind-dune? 6. What impact does C. germana have on the reproductive output of C. m. subsp. rotundata? Sampling was undertaken at 14 sites along a 900km stretch of the NSW coastline to determine damage levels by C. germana. Soil samples were also taken at all 14 sites and the seeds from the soil samples were counted and examined for evidence of M. polana infestation. In addition to the sampling observations a manipulative experiment was undertaken at Windang Beach using the pesticide exclusion method . Both agents were found to be distributed along the entire range of bitou bush. Tip damage by C. germana was highly variable but was consistently more effective at the fore dune position. C. germana was found to reduce flower production by 15% to 59%. Tip damage by C. germana increased from north to south. The average rate of damage to seeds by M. polana was 11%. Dune location did not affect the amount of seed damaged by M. polana and latitude did not influence seed damage. C. germana and M. polana are reducing the reproductive 2 output of bitou bush and in conjunction with other control methods, such as aerial spraying, will have significant effect on reducing the weeds impact. 3 ACKNOWLEDGEMENTS I would like to thank my supervisor Professor Kris French for her support and encouragement over the course of my research particularly for her assistance with the statistical analysis. Thank you to my family, especially my son and husband who proved to be excellent field assistants. I would also like to thank my circle of friends who have encouraged me to continue with the preparation of this thesis when at times I felt it was beyond my capabilities. 4 TABLE OF CONTENTS ABSTRACT ................................................................................................................. 2 ACKNOWLEDGEMENTS ......................................................................................... 4 TABLE OF CONTENTS ............................................................................................. 5 LIST OF FIGURES ..................................................................................................... 6 LIST OF TABLES ....................................................................................................... 7 1 Chapter 1 Introduction of Literature Review ................................................ 8 1.1 Invasive Weeds: A Global Problem ............................................................... 8 1.2 The Management of Weeds …………………………………………………..9 1.3 The History and Theory of Biological Control ………………………………9 1.4 Studies Species Biology and Background………………………………..….29 1.5 Conclusions and justification for research…………………………….…….34 2 Chapter 2: The fickle activity of a fly and a moth: Habitat variation of biological control agents introduced to control the invasive weed Chysanthemoides monilifera ……………………………………………………………………….…..36 2.1 Introduction…………………………………………………………………36 2.2 Methods …………………………………………………………………….38 2.3 Analysis……………………………………………………………………..42 2.4 Results ………………………………………………………………..….…43 2.5 Discussion ……………………………………………………………….…49 3: Chapter 3: Can the level of damage inflicted by a biological control agent be maintained over decades? …………………………………………………….……..52 3.1 Introduction ……………………………………...........................................52 3.2 Methods ………………………………………………………………….…54 3.3 Analysis …………………………………………………………….……....55 3.4 Results …………………………………………………………………..….56 3.5 Discussion ………………………………………………………………….60 4. Chapter 4: Discussion and Recommendations ………………………...…63 4.1 References …………………………………………...………...………...…66 5 LIST OF FIGURES BITOU TIP MOTH (COMOSTOLOPSIS GERMANA) ………………………………..32 BITOU SEED FLY (MESOCLANIS POLANA)………………………………………..33 LOCATION OF 14 BEACHES THAT WERE SAMPLED ALONG THE NSW COASTLINE ……….39 FORE DUNE AND HIND DUNE VEGETATION ZONES ………………………….40 BITOU BUSH SEED WITH EXIT HOLE OF TIP FLY LARVAE …………………..41 COMPARISON OF OVERALL AVERAGE PERCENTAGE TIP DAMAGE BETWEEN DUNE POSITIONS ……………….43 COMPARISON OF FORE DUNE AND HIND DUNE TIP DAMAGE AT THE 14 SAMPLED BEACH SITES …………………………………………………………….45 AVERAGE NUMBER OF SEEDS OF C. MONILIFERA IN FORE DUNE AND HIND DUNE HABITATS …………………………………………………………………….47 SAMPLE SITES OF BACK BEACH SOUTH WEST ROCKS ……………………...50 SUM OF FLOWERS COUNTED IN MARCH 2015 …………………………………58 SUM OF FLOWERS COUNTED IN OCTOBER 2015 ………………………………58 SUM OF FLOWERS COUNTED IN NOVEMBER 2015 ……………………………59 COMPARISON OF FLOWERS COUNTED FOR CONTROL AND TREATED PLANTS AT EACH TIME PERIOD AND DUNE HABITAT …………………………………59 6 LIST OF TABLES SUMMARY TABLE OF TERRESTRIAL WEEDS OF AUSTRALIA WITH A MINIMUM OF ONE ESTABLISHED BIOCONTROL AGENT/S ……………………………….13-28 BIOCONTROL AGENTS RELEASED FOR CHRYSANTHEMOIDES MONILIFERA SPP. ROTUNDATA …………………………………………………………………………………...31 LEVELS OF CLASSIFICATION OF OBSERVED TIP DAMAGE …….………….41 SUMMARY DATA TABLE FOR TIP DAMAGE BY C. GERMANA ………………44 COMPARISON OF FORE DUNE AND HIND DUNE SHOWING SEEDS AND THE PROPORTION WITH EXIT HOLES ………………………………………………..48 NUMBERS OF FLOWERS COUNTED AT EACH HABITAT FOR EACH TREATMENT TYPE …………………………………………………………………………………..57 RESULTS OF ANALYSIS OF VARIANCE USING GREENHOUSE-GEISER ESTIMATES …………………………………………………………………………57 7 CHAPTER 1: GENERAL INTRODUCTION 1.1 Invasive Weeds: A Global Problem Invasive plants, as defined by Richardson et al. (2000) are naturalized plants that produce reproductive offspring, often in very large numbers, which can move considerable distances from parent plants and have the potential to spread over a large area. The consequence of this
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