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THE Parasltolds of SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA LEDERER

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THE Parasltolds of SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA LEDERER THE PARASlTOlDS OF SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA LEDERER (LEPIDOPTERA:TORTRICIDAE), IN MANITOBA A Thesis Submitted to the Facuky of Graduate Studies The University of Manitoba by Deirdre A. Zebrowski In Partial Fuifilment of the Requirements for the Degree of Master of Science O July 1998 National Libraiy Bibliothèque nationale du Canada Acquisitions and Acquisitions et Bibliographie Services senfices bibliographiques 395 welrimeet 395. me wemlgtori ûüawaON K1A ON4 OttawaON K1AON4 Canada canada The author has granted a non- L'auteur a accordé une licence non exclusive licence allowing the exclusive permettant a la National Library of Canada to Bibliothèque nationale du Canada de reproduce, loan, distniute or sell reproduire, prêter, distniuer ou copies of this thesis m microform, vendre des copies de cette thèse sous paper or electronic formats. la fome de microfiche/film, de reproduction sur papier ou sur format électronique. The author retains owndpof the L'auteur conserve la propiété du copyright in this thesis. Neither the droit d'auteur qui protège cette thèse. thesis nor substantial extracts fkom it Ni la thèse ni des extraits substantiels may be printed or otherwise de celle-ci ne doivent être imprimés reproduced without the author's ou autrement reproduits sans son permission. autorisation. FACULTY OF GRADUATE STüDIES ***+* COPYRIGHT PER%IISSIONPAGE A ThesislPracticum submitted to the Faculty of Graduate Studies of The Univehie of Manitoba in partiai fbifihnent of the requirernents of the degree of m!nzB OP SCZERCE Dierdre A. Zebrowski G1998 Permission has been granted to the Library of The Uuivenity of Manitoba to lend or sell copia of this tbesidpracticum, to the National Library of Canada to microfilm thic tbuis and to lend or sell copies of the fdm, and to Dissertations Abstracts International to publish an abstract of this thesidpracticnm. The author raervu other pubiication rights, and neither this thesis/practicurn nor extensive extracts from it rnay be printed or otherwise reproduced without the author's written permission, .* Il Acknowledgements I would like to thank my supervisor, Dr. Neil Holliday. His patience, support, and time in this projed were greatly appreciated. Iwould also like to thank my cornmittee rnemberç, Dr. Terry Galloway, Dr. Bill Remphrey, and Dr. Richard Westwood, for their time and valuable suggestions. In addition, I would like to thank Dr. PA. Mackay for agreeing to sit on my cornmittee while Dr. Galloway is away on sabbatical. I also thank Dr. Westwood for his assistance in confirming the identification of some of the Lepidoptera collected in this study. Advice and assistance in fmding suitable sites for this project were pmvided by Keith Knowles of the Manitoba Forestry Branch. I offer thanks to Steve Pollack (Canadian Forest Service - Fredericton), Dr. Eldon Eveleigh (Canadian Forest Service - Fredericton), and Dr. Vince Nealis (Great Lakes Forestry Centre - Sault Ste. Marie) for their advice and assistance in identiing the parasitoids. The identification of the pentatomid bugs by Dr. Dave Rider (North Dakota State University) was much appreciated. I would like to offer special thanks to the following people for their assistance in the field, laboratory, and for lending helping hands in many other ways throughout this project: Mr. Rhéal Lafrenière, Ms. Sheila Campbell, Mr. Roger Larios, Mr. Jason Diehl, Mr. Jaspreey Grewal, Mr. Dave Holder, Ms. Carla Wykytnish and Mr. Brent Elliott. The funding for this pmject was provided by the Canada Manitoba Partnership Agreement in Forestry and The Canadian Shield Foundation Inc. Absttact Zebrowski, DA., MSc. The University of Manitoba, 1998. The Parasitoids of Spruce Budworrn. Chonsioneum firmiferana Lederer (Lepidoptera:Tortricidae), in Manitoba. Major Professor: N. J. Holliday The parasitoids of epidemic and endemic spruce budworm populations were studied in eastem Manitoba in the summers of 1994 and 1995. Three sites were established, two in epidemic budworm populations, and one in an endemic budworm population. Sampling of the sites ocwrred from eady May and wntinued until viable egg masses were no longer found in the collections. Budworm were reared on arüficial diet until either a parasitoid or moth ernerged. In 1995, a second site was established in the endemic population into which approximately 3000 budworm larvae were released. This site was established in order to collect parasitoids that are present but may not be collected through regular sarnpling of endemic populations. There were 16 parasitoid species collected from Manitoba. The parasitoid species collected from the epidemic budworm populations were similar to the species collected from epidemic populations in other locations. Several species found to be of importance in endemic budworm populations in localities other than Manitoba were not collected in this shidy. Lypha setifacies (West), which was collectecl in the endemic site in Manitoba, has not been previously recorded from an endemic budwom population. The parasitoid guilds in the epidemic and endemic budworm populations were found to difFer from each other. The differenœ in the two parasitoid g uilds centres around the relative abundance of three parasitoid species: L. setifacies. Mebotus iachynotus Vier., and Enytus montanus (As hmead). Although al1 three of these species were collecteci in both epidernic and endernic populations, each had a higher relative abundance within the endemic parasitoid guild than within the epidemic guild. The parasitoid guild attacking budwom feeding on spruce differed frorn the parasitoid guild attacking budworm feeding on fir. This difference arose from decreased host availability on spruce for late larval and pupal parasitoids due to a higher rate of mortality on spruce than on fir. This resulted in eariy larval parasitoids comprising a much higher proportion of the parasitoid guild attacking spruce than of the guild attacking fir. Earlier studies have suggested that delaying spraying for the spnice budworm until fourth instar can help conserve the parasitoid Apanfeles fumiinae Mer. Examination of day degree accumulation and the related timing of budwom instars in this study suggests that delaying spraying for spruce budworm until early June will help conserve Apanleles fumnemnna Mer. in the study area. Table of Contents Abstract ....................................................... iii List of Tables .................................................. viii Introduction ..................................................... 1 Thespnicebudwomi ........................................ 1 Taxonorny and distribution .............................. 1 Biology ............................................ 2 Populationdynamics ...................................4 Spruce budwotm in Manitoba ................................. 5 Literature Review ................................................ 8 Introduction ............................................... 8 Definitions ................................................ 8 Populationdynamics ........................................ 8 Çampling spruce budworm .................................. 14 Assessing rnortality ................................... 14 Branch samples ..................................... 14 Parasitoids of the spnice budwom ............................ 15 Parasitoids in epidemic populations ...................... 15 Parasitoids attacking small larvae ........................ 16 Parasitoids attacking third and fourth instars ............... 20 Parasitoids ettacking large larvae ........................ 21 Parasitoids attacicing pupae ............................ 24 Parasitoids in endemic populations ....................... 27 Factors affecting parasitoids ............................ 29 Previous studies in Manitoba ................................. 31 MaterialsandMethods .......................................... -33 Studydesign ............................................. 33 Standselection ........................................... 34 Sitese'up ............................................... 35 Sampling procedures ....................................... 35 Sitecharacterization .................................. 35 lnsectsampling ........................................... 37 Field procedures ..................................... 37 Laboratory procedures ............................... Identification ........................................ 42 Releasesite .............................................. 43 Environmenbl data collection ................................ 43 Temperature ........................................43 LigM intensity ....................................... 47 Dataanalysis ............................................. 47 Temperature calculations .............................. 47 Detenination of apparent rate of parasitism ............... 48 Loglinearmodels ......................A............ 48 Correspondence analysis ..............................49 LinearRegression .................................... 51 Resutîs ....................................................... 53 Sifecharacten'stics ......................................... 53 Vegetaüon .......................................... 53 Topography ......................................... 54 Light intensity ....................................... 55 Spruce budwom collections .................................56 Parasitoidspecies ......................................... 56 Interactions of parasitism rate with host location .................. 58 Ordination
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