Plant-Derived Chemicals As Tick Repellents
Total Page:16
File Type:pdf, Size:1020Kb
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 574 Plant-Derived Chemicals as Tick Repellents SAMIRA SADEK GARBOUI ACTA UNIVERSITATIS UPSALIENSIS ISSN 1651-6214 UPPSALA ISBN 978-91-554-7337-2 2008 urn:nbn:se:uu:diva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lory be to Allah (God) we have knowledge except what Allah has taught us. Verily, Allah is the All-Knower and the All-Wise. The Nobel Quraan (Surah 2, versus 32) In memory of my Father Elsadek Garboui To my mother Fathia Ahmed To my Family Gumaa, Maram, Rouaa and Mossa Cover photo: Biopix.dk List of Papers This thesis is based on the following papers, which are referred to in the text by their Roman numerals: I Jaenson, T. G. T., Garboui, S. and Pålsson, K. 2006. Repellency of oils of lemon eucalyptus, geranium, and lavender and the mosquito repellent MyggA Natural to Ixodes ricinus (Acari: Ixodidae) in the laboratory and field. J. Med. Entomol. 43:731- 736. II Garboui, S. S., Jaenson, T. G. T. and Pålsson, K. 2006. Repel- lency of MyggA® Natural spray (para-menthane 3, 8-diol) and RB86 (neem oil) against the tick Ixodes ricinus (Acari: Ixodidae) in the field in east-central Sweden. Exp. Appl. Acarol. 40:271- 277. III Garboui, S. S., Jaenson, T. G. T., Borg-Karlson, A-K., and Påls- son, K. 2007. Repellency of methyl jasmonate to Ixodes ricinus nymphs (Acari: Ixodidae). Exp. Appl. Acarol.42:209-215. IV Ashitani, T., Garboui, S. S., Pålsson, K., Vongsombath, Ch., Jaenson, T. G. T., and Borg-Karlson, A-K. 2008. Hyptis suaveolens a source for arthropod repellent compounds. Repel- lency of sesquiterpene oxides and sulfides to Ixodes ricinus. Submitted. V Garboui, S. S., Borg-Karlson, A-K., and Pålsson, K. 2008. Tick repellent properties of three Libyan plants. Submitted. Papers I, II and III are reprinted with the kind permission of the publisher. Contents Introduction.....................................................................................................9 Ticks (Acari: Ixodidae) ..............................................................................9 Tick Control .............................................................................................11 Biological control ................................................................................11 Chemical Control.................................................................................12 Personal Protection ..............................................................................16 Plants used in this study ...........................................................................17 Aims .........................................................................................................20 Materials and Methods..................................................................................21 Study areas ...............................................................................................21 Sampling method......................................................................................21 Plant oils and arthropod repellents ...........................................................22 Laboratory bioassays................................................................................23 Repellency test on I. ricinus nymphs...................................................23 Steam distillation (IV and V)...............................................................24 Collection of volatile substances from the leaves and oils (IV and V)..........24 Identification of compounds (IV and V)..............................................25 Field experiments .....................................................................................26 Statistical analyses....................................................................................27 Results and Discussion .................................................................................28 Laboratory bioassays................................................................................28 Repellency test on I. ricinus nymphs...................................................28 Field experiments .....................................................................................41 Concluding remarks .................................................................................48 Sammanfattning (Swedish summary) ...........................................................49 Acknowledgements.......................................................................................52 References.....................................................................................................54 Abbreviations AI3-37220 1-(3-cyclohexen-1-yl-carbonyl)-2- methylpiperidine DEET N, N-diethyl-3-methylbenzamide GC-MS Gas Chromatography-Mass Spectrometry IR3535 Insect Repellent (3-(N-n-butyl-N- acetyl)-aminopropionic acid ethyl ester). KBR3023 1-piperidinecarboxylic acid, 2-(2- hydroxyethyl)-, 1-ethylpropylester LB Lyme borreliosis LD Lyme disease MJ Methyljasmonate MS Mass Spectrometry NIST National Institute of Standards and Technology PMD Para-menthane-3, 8-diol RB86 Neem oil 70% SPME Solid Phase Micro Extraction TBE Tick-borne encephalitis Introduction Ticks have recently attracted great attention and are currently considered to be second only to mosquitoes as vectors of human infectious diseases throughout the world. Each vector tick species prefers particular optimal environmental conditions and biotopes: these preferences determine the geo- graphic distribution of ticks and, consequently, the risk areas for tick-borne diseases. In non-tropical areas the main vector-borne disease is Lyme disease (LD) caused by Borrelia burgdorferi (Johnson) sensu lato and transmitted by Ixodes spp. Lyme disease is the most commonly reported vector-borne hu- man illness in the northern temperate hemisphere. Personal protection with repellents against blood-sucking arthropods is one strategy to prevent infec- tion with vector-borne diseases. Increasingly efforts have been made to de- velop alternatives to replace synthetic chemical repellents including the ex- traction and evaluation for repellent activity of plant products. It is well known that plants produce a wide range of compounds that act as a defense against herbivory. The development and use of locally available plant prod- ucts showing repellent activity is thus an alternative strategy for prevention of tick-borne diseases. Several studies have been carried out to evaluate the repellent action of compounds from various parts of plants. Some have pro- vided good protection against many blood-sucking arthropods (Davis 1985, Gupta and Rutledge 1989, Malonza et al. 1992, Ansari and Razdan 1994, Barnard 1999, Barnard 2000, Jaenson et al. 2003). Repellents are relatively inexpensive and a practical means of protection against nuisance and disease vector arthropods, especially when other control measures are not feasible. Ticks (Acari: Ixodidae) Ixodidae, or hard ticks, are large blood-sucking Acari. The family Ixodidae is comprised of 13 genera of which 7 contain species of medical importance (Kettle 1995). The largest genus is Ixodes, which is estimated to have more than 200 species world wide (Kettle 1995). The developmental cycle of ticks includes four stages: egg, larva, nymph and adult. There are no sexually differentiating morphological characters until the adult stage is reached. Ixodes are usually present in humid environments, quest freely on the vege- tation or in the host’s nest or burrows and feed only once in each stage. Ticks are obligate ectoparasites of terrestrial vertebrates and are well known 9 as important vectors transmitting pathogenic micro-organisms to animals and humans in many parts of the world (Sonenshine 1993). Ticks affect their hosts by transmitting disease organisms, causing paralysis, reducing their growth rates and milk production, and by injuries leading to secondary infec- tions (Kettle 1995). In Sweden, >10 species of Ixodidae (hard ticks) occur on a regular basis (Jaenson et al. 1994). The most common and the medically most important tick in Europe is Ixodes ricinus L. This tick species has a very wide geographical distribution throughout most of Europe, including the British Isles. Stable populations are also present in northern Africa (Gray 1991). I. ricinus is involved in the transmission of spirochetes of B. burgdorferi s. l. which causes Lyme borreliosis (LB) or Lyme disease (Sonenshine 1993), the most common tick-borne human disease in Europe and the United States. The highest