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Developing an Attractant for Monitoring Fruit-Feeding Moths in Citrus Orchards

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Developing an Attractant for Monitoring Fruit-Feeding Moths in Citrus Orchards Developing an attractant for monitoring fruit-feeding moths in citrus orchards A thesis submitted in fulfilment of the requirements for the degree of MASTER OF SCIENCE of RHODES UNIVERSITY by Mathew Keith Goddard February 2016 Abstract Fruit-piercing moths are a sporadic pest of citrus, especially in the Eastern Cape Province of South Africa, where the adults can cause significant damage in outbreak years. Currently the only way in which to successfully control fruit-feeding moths within the orchards is the use of repellent lights. However, growers confuse fruit-piercing moths with fruit-sucking moths that don‘t cause primary damage, and there is no way of monitoring which moth species are attacking the fruit in the orchards during the night. In a previous study, banana was shown to be the most attractive bait for a variety of fruit-feeding moth species. Therefore the aim of this study was to determine the population dynamics of fruit-feeding moths develop a cost- effective alternative to the use of fresh banana as a bait for fruit-piercing moths. Fresh banana was compared to nine alternative synthetic attractants, frozen banana and a control under field conditions in several orchards in the Eastern Cape Province. Once again, banana was shown to be the most attractive bait. Some 23 species of fruit-feeding moth species were sampled in the traps, but there was only two fruit-piercing species, Serrodes partita (Fabricius) (Lepidoptera: Noctuidae) and Eudocima sp. Surprisingly S. partita, which was thought to be the main pest, comprised only 6.9% of trap catches. Serrodes partita, is a sporadic pest, only becoming problematic every five to 10 years after good rainfall in the Little Karoo region that causes flushes of their larval host, wild plum, Pappea capensis (Ecklon & Zeyher). During these outbreaks, damage to fruit can range from 70 to 90% and this is especially so for soft skinned citrus. A study on the morphology of the proboscis confirmed that only two species of fruit-piercing moths were present. Trap catches over three citrus growing seasons was linked to fruit damage found within several orchards. Once again fruit-piercing moth damage was relatively low in comparison to other types of damage such as mechanical and undefined damage. There was a very weak correlation between S. partita trap catches and damage, but generally damage was recorded two to three weeks after a peak in S. partita trap catches. Climatic conditions were also recorded and compared to weekly trap catches of S. partita, and while temperature and wind direction had no influence on moth populations, precipitation in the orchards was weakly correlated with trap catches. This study has shown that in non-outbreak seasons, the main fruit-piercing moth, S. partita comprises a small percentage of fruit-feeding moths in citrus orchards, but that growers are unable to determine the difference between fruit-piercing species and the harmless fruit-sucking species. Further fresh banana remains the best method for attracting fruit-piecing moths to traps, but this is not cost effective and thus a commercially viable protocol for monitoring these species remains elusive. i Acknowledgements Firstly I would like to give a big thank you to all parties responsible for the funding of this thesis whether this be for living costs, tuition or running costs of the project – Citrus Research International, Citrus Academy and Rhodes University. South African Weather Service for supplying me with weather data for the past three growing seasons. I would like to acknowledge and thank a number of individuals for their help in one way or another: Prof. Martin Hill and Dr. Sean Moore for their supervision, guidance and faith in me during the course of my work. Thank you for all the time you put into reading and correcting my thesis. Jeanne van de Merwe for her financial assistance. Wayne Kirkman for allowing showing me where and how to find S. partita larvae. Allowing me to make use of his farm to look for larvae and adult moths. Shaun Brown, Rob and Steve Moss, Sieg Gericke, Peter Crawford and Louis De Villers for allowing me to make use of their citrus orchards for field trials. Tammy Marsberg, Ryan van Zeeventer, Tanya Pretorius, Sean Thackeray, Erin Soutar and Melissa Pollard for being available to help me with my field and lab work, either replacing baits, collecting moths, driving or taking SEM micrographs. Ashley Goddard thank you for all the time you put into reading and correcting my thesis. A huge thank you for always being there for me to give me guidance at any time of day and having the faith in me, pushing me to reach my goals, during the course of my work. Again, thank you to anyone I failed to mention, who helped me in this thesis. Without you it would not have been possible. ii Table of Contents Abstract............................................................................................................................... i Acknowledgments .............................................................................................................. ii Table of Contents ............................................................................................................... iii List of Figures..................................................................................................................... viii List of Tables ...................................................................................................................... xv 1 Chapter 1 - General Introduction ......................................................................... 1 1.1 CITRUS IN SOUTH AFRICA ............................................................................ 1 1.1.1 Citrus production and export .................................................................... 1 1.1.2 Citrus pests: General overview ................................................................. 4 1.1.3 Control of citrus pests ............................................................................... 7 1.2 FRUIT-FEEDING MOTHS ................................................................................. 8 1.2.1 Categories of fruit-feeding moths ............................................................. 8 1.2.2 Fruit-piercing moths ................................................................................. 9 1.2.3 Fruit-sucking moths .................................................................................. 10 1.2.4 Economic importance ............................................................................... 10 1.2.5 Control of fruit-feeding moths.................................................................. 11 1.3 SERRODES PARTITA .......................................................................................... 12 1.3.1 Nomenclature ........................................................................................... 12 1.3.2 Biology ..................................................................................................... 12 1.3.3 Distribution and host range ...................................................................... 15 1.3.4 Life history ............................................................................................... 16 1.3.5 Economic importance and threshold ........................................................ 16 1.3.6 Control measures ...................................................................................... 17 1.3.6.1 Chemical control ............................................................................. 17 1.3.6.2 Traps and barriers ............................................................................ 17 1.3.6.3 Biological control ............................................................................ 18 1.3.6.4 Cultural control ............................................................................... 18 1.4 ACHAEA LIENARDI ............................................................................................ 19 1.4.1 Nomenclature ........................................................................................... 19 1.4.2 Biology ..................................................................................................... 19 iii 1.4.3 Distribution and host range ...................................................................... 20 1.4.4 Control ...................................................................................................... 20 1.5 RESEARCH AIMS .............................................................................................. 21 2 Chapter 2 - Fruit-feeding moth species found in citrus orchards of Tshipise and Eastern Cape ....................................................................................... 22 2.1 INTRODUCTION ................................................................................................ 22 2.2 MATERIALS AND METHODS ......................................................................... 23 2.2.1 Collecting protocol ................................................................................... 23 2.2.2 Identification of fruit-feeding moths sampled in traps in the orchards .... 24 2.2.3 Statistical analysis .................................................................................... 25 2.3 RESULTS ............................................................................................................. 25 2.3.1 Identification of fruit-feeding moths ....................................................... 25 2.3.2 Abundance and diversity
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