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Pohoria Burda Na Dostupných Historických Mapách Je Aj Cieľom Tohto Príspevku
OCHRANA PRÍRODY NATURE CONSERVATION 27 / 2016 OCHRANA PRÍRODY NATURE CONSERVATION 27 / 2016 Štátna ochrana prírody Slovenskej republiky Banská Bystrica Redakčná rada: prof. Dr. Ing. Viliam Pichler doc. RNDr. Ingrid Turisová, PhD. Mgr. Michal Adamec RNDr. Ján Kadlečík Ing. Marta Mútňanová RNDr. Katarína Králiková Recenzenti čísla: RNDr. Michal Ambros, PhD. Mgr. Peter Puchala, PhD. Ing. Jerguš Tesák doc. RNDr. Ingrid Turisová, PhD. Zostavil: RNDr. Katarína Králiková Jayzková korektúra: Mgr. Olga Majerová Grafická úprava: Ing. Viktória Ihringová Vydala: Štátna ochrana prírody Slovenskej republiky Banská Bystrica v roku 2016 Vydávané v elektronickej verzii Adresa redakcie: ŠOP SR, Tajovského 28B, 974 01 Banská Bystrica tel.: 048/413 66 61, e-mail: [email protected] ISSN: 2453-8183 Uzávierka predkladania príspevkov do nasledujúceho čísla (28): 30.9.2016. 2 \ Ochrana prírody, 27/2016 OCHRANA PRÍRODY INŠTRUKCIE PRE AUTOROV Vedecký časopis je zameraný najmä na publikovanie pôvodných vedeckých a odborných prác, recenzií a krátkych správ z ochrany prírody a krajiny, resp. z ochranárskej biológie, prioritne na Slovensku. Príspevky sú publikované v slovenskom, príp. českom jazyku s anglickým súhrnom, príp. v anglickom jazyku so slovenským (českým) súhrnom. Členenie príspevku 1) názov príspevku 2) neskrátené meno autora, adresa autora (vrátane adresy elektronickej pošty) 3) názov príspevku, abstrakt a kľúčové slová v anglickom jazyku 4) úvod, metodika, výsledky, diskusia, záver, literatúra Ilustrácie (obrázky, tabuľky, náčrty, mapky, mapy, grafy, fotografie) • minimálne rozlíšenie 1200 x 800 pixelov, rozlíšenie 300 dpi (digitálna fotografia má väčšinou 72 dpi) • každá ilustrácia bude uložená v samostatnom súbore (jpg, tif, bmp…) • používajte kilometrovú mierku, nie číselnú • mapy vytvorené v ArcView je nutné vyexportovať do formátov tif, jpg,.. -
Tephritidae (Fruchtfliegen)
ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Entomologische Berichte Luzern Jahr/Year: 1989 Band/Volume: 22 Autor(en)/Author(s): Merz Bernhard Artikel/Article: Zur lnsektenfauna von Gersau-Oberholz, Kanton Schwyz *) VIII. Diptera 1: Tephritidae (Fruchtfliegen). 103-106 Entomologische Berichte©Natur-Museum Luzem Luzern 22,1989 und Entomologische Gesellschaft Luzern; download www.biologiezentrum.at 103 Zur flnsektenfauna von Gersau-Oberholz, Kanton Schwyz *) VIII. Dtptera 1: Tephritidae (Fruchtfliegen) von B. MERZ Zusammenfassung Aus dem Gebiet Gersau-Oberholz wurden in den Jahren 1979-83 und 1989 insgesamt 42 Tephritiden ge sammelt, die 14 Arten angehören. Diese Arten sind ausnahmslos Neufunde für die Zentralschweiz. Für Tephritis separata ROND. wird als neue Futterpflanze Picris hieracioides nachgewiesen. 1. EINLEITUNG In den Jahren 1979-83 wurden am relativ warmtrockenen Südhang der Rigi-Hochfluh, in Gersau-Oberholz (500-650 m, Erika-Waldföhrenheide und Eichen-Linden-Ahorn- Eschen-Laubmischwald), Kanton Schwyz, von Herrn Dr. L. RESER (REZBANYAI) mit Licht- und Tagfang sowie mit Bodenfallen regelmässig Insekten gesammelt. In der Ausbeute, die im Natur-Museum Luzern aufbewahrt ist, befinden sich auch eini ge Tephritiden, die mir freundlicherweise zur Bestimmung überlassen wurden. Ergänzt wird die Ausbeute durch eine vom Verfasser am 10.7.1989 im Gebiet durch geführte Sammelexkursion. Dabei wurden nebst dem Netzfang auch mit Tephritiden befallene Pflanzenproben mitgenommen, aus denen im Verlaufe des Sommers weite re Fruchtfliegen schlüpften. Allgemeine Hinweise zur geographischen Lage, Ökologie und Vegetation des Gebie tes sowie über die genauen Fangmethoden finden sich bei REZBANYAI-RESER 1984. Für die Überlassung der Fliegen zur Bestimmung möchte ich recht herzlich Herrn Dr. -
365 Fauna Vrsta Tephritinae (Tephritidae, Diptera
M. Bjeliš: Fauna vrsta Tephritinae (Tephritidae, Diptera) sakupljenim u primorskoj Hrvatskoj tijekom 2005. i 2006. godine FAUNA VRSTA TEPHRITINAE (TEPHRITIDAE, DIPTERA) SAKUPLJENIH U PRIMORSKOJ HRVATSKOJ TIJEKOM 2005 I 2006 GODINE. FAUNA OF THE TEPHRITINAE SPECIES (TEPHRITIDAE, DIPTERA) COLLECTED IN THE CROATIAN LITTORAL IN 2005 AND 2006. M. Bjeliš SAŽETAK Tijekom faunističkih istraživanja koja su provedena na području primorske Hrvatske u 2005. i 2006. godini, na osamdeset i jednom lokalitetu, sakupljeno je dvadeset i devet vrsta koje pripadaju u osamnaest rodova. Utvrđena je nazočnost sljedećih vrsta: Acanthiophylus helianthi R., Aciura coryli R., Campiglossa misella L., Campiglosa producta L., Chaetorellia jaceae RD., Chaetostomella cylindrica RD., Dioxyna bidentis RD., Ensina sonchi L., Euaresta bullans L., Myopites stylatus F., Myopites zernii H., Noeeta pupillata F., Orellia falcata S., Oxiaciura tibialis RD., Sphenella marginata F., Tephritis carmen H., Tephritis divisa R., Tephritis formosa L., Tephritis matricariae L., Tephritis praecox L., Tephritis separata R., Terellia gynaeacochroma H., Terellia seratulae L., Terellia tussilaginis F., Trupanea amoena F., Trupanea stelata F., Urophora solstitialis L., Urophora stylata F., i Xyphosia miliaria RD. Ključne riječi: Fauna, primorska Hrvatska, Tephritinae, Tephritidae, ABSTRACT: During the fauna research carried out along the Croatian littoral in the years 2005. and 2006. on eighty one locations, twenty-nine species belonging to the eighteen genus were collected. The following species were confirmed: Acanthiophylus helianthi R., Aciura coryli R., Campiglossa misella L., Campiglosa producta L., Chaetorellia jaceae RD., Chaetostomella cylindrica RD., Dioxyna bidentis RD., Ensina sonchi L., Euaresta bullans L., Myopites stylatus F., Myopites zernii H., Noeeta pupillata F., Orellia falcata S., 365 M. Bjeliš: Fauna vrsta Tephritinae (Tephritidae, Diptera) sakupljenim u primorskoj Hrvatskoj tijekom 2005. -
Insect Pest Management: Oral Presentations in Programme Order
ABSTRACTS: Insect Pest Management: Oral Presentations In programme order Session 10 (Part I) Session 13 (Part II) Session 16 (Part III) Session 18 (Part IV) Session 21 (Part V) Session 24 (Part VI) Pheromone identification by SSGA – an analytical method using circadian rhythms of volatile emissions Anat Levi-Zada Agricultural Research Organization, Volcani Center, Israel The SSGA (Sequential SPME/GCMS analysis) method uses circadian rhythms of volatile emissions for identifying insect pheromones. The history/background in development of the SSGA method will be presented along with its advantages compared to other established methods. The usefulness of the SSGA method and how it can be implemented to gain circadian information on semiochemicals and pheromones will be demonstrated with examples of different pest insects such as moths, fruit flies, and mealybugs. I will also show how these volatiles can be further tested for their biological activity in order to optimize effective attractants. Keywords: Circadian rhythm; SPME; moth; mealybugs; fruit flies Nanofibers as carrier of push substances against pear psyllids Bruna Czarnobai De Jorge1, Hans E. Hummel2, Jürgen Gross1 1Julius Kühn-Institut, Federal Research Center for Cultivated Plants, Institute for Plant Protection in Fruit Crops and Viticulture, Laboratory of Applied Chemical Ecology, Schwabenheimer Str. 101, 69221 Dossenheim, Germany 2Justus-Liebig-University Gießen, Gießen, Germany Pear decline (PD) is a bacterial disease that causes considerable financial losses for growers in pear-growing areas in Europe. Fighting this disease requires a reliable and inexpensive method for protecting orchards against pear psyllids, which are the major responsible of its transmission. The need for alternatives to insecticides has stimulated studies on the use of plant essential oils and plant extracts against pest insects. -
Dipterists Forum
BULLETIN OF THE Dipterists Forum Bulletin No. 76 Autumn 2013 Affiliated to the British Entomological and Natural History Society Bulletin No. 76 Autumn 2013 ISSN 1358-5029 Editorial panel Bulletin Editor Darwyn Sumner Assistant Editor Judy Webb Dipterists Forum Officers Chairman Martin Drake Vice Chairman Stuart Ball Secretary John Kramer Meetings Treasurer Howard Bentley Please use the Booking Form included in this Bulletin or downloaded from our Membership Sec. John Showers website Field Meetings Sec. Roger Morris Field Meetings Indoor Meetings Sec. Duncan Sivell Roger Morris 7 Vine Street, Stamford, Lincolnshire PE9 1QE Publicity Officer Erica McAlister [email protected] Conservation Officer Rob Wolton Workshops & Indoor Meetings Organiser Duncan Sivell Ordinary Members Natural History Museum, Cromwell Road, London, SW7 5BD [email protected] Chris Spilling, Malcolm Smart, Mick Parker Nathan Medd, John Ismay, vacancy Bulletin contributions Unelected Members Please refer to guide notes in this Bulletin for details of how to contribute and send your material to both of the following: Dipterists Digest Editor Peter Chandler Dipterists Bulletin Editor Darwyn Sumner Secretary 122, Link Road, Anstey, Charnwood, Leicestershire LE7 7BX. John Kramer Tel. 0116 212 5075 31 Ash Tree Road, Oadby, Leicester, Leicestershire, LE2 5TE. [email protected] [email protected] Assistant Editor Treasurer Judy Webb Howard Bentley 2 Dorchester Court, Blenheim Road, Kidlington, Oxon. OX5 2JT. 37, Biddenden Close, Bearsted, Maidstone, Kent. ME15 8JP Tel. 01865 377487 Tel. 01622 739452 [email protected] [email protected] Conservation Dipterists Digest contributions Robert Wolton Locks Park Farm, Hatherleigh, Oakhampton, Devon EX20 3LZ Dipterists Digest Editor Tel. -
Diversity and Resource Choice of Flower-Visiting Insects in Relation to Pollen Nutritional Quality and Land Use
Diversity and resource choice of flower-visiting insects in relation to pollen nutritional quality and land use Diversität und Ressourcennutzung Blüten besuchender Insekten in Abhängigkeit von Pollenqualität und Landnutzung Vom Fachbereich Biologie der Technischen Universität Darmstadt zur Erlangung des akademischen Grades eines Doctor rerum naturalium genehmigte Dissertation von Dipl. Biologin Christiane Natalie Weiner aus Köln Berichterstatter (1. Referent): Prof. Dr. Nico Blüthgen Mitberichterstatter (2. Referent): Prof. Dr. Andreas Jürgens Tag der Einreichung: 26.02.2016 Tag der mündlichen Prüfung: 29.04.2016 Darmstadt 2016 D17 2 Ehrenwörtliche Erklärung Ich erkläre hiermit ehrenwörtlich, dass ich die vorliegende Arbeit entsprechend den Regeln guter wissenschaftlicher Praxis selbständig und ohne unzulässige Hilfe Dritter angefertigt habe. Sämtliche aus fremden Quellen direkt oder indirekt übernommene Gedanken sowie sämtliche von Anderen direkt oder indirekt übernommene Daten, Techniken und Materialien sind als solche kenntlich gemacht. Die Arbeit wurde bisher keiner anderen Hochschule zu Prüfungszwecken eingereicht. Osterholz-Scharmbeck, den 24.02.2016 3 4 My doctoral thesis is based on the following manuscripts: Weiner, C.N., Werner, M., Linsenmair, K.-E., Blüthgen, N. (2011): Land-use intensity in grasslands: changes in biodiversity, species composition and specialization in flower-visitor networks. Basic and Applied Ecology 12 (4), 292-299. Weiner, C.N., Werner, M., Linsenmair, K.-E., Blüthgen, N. (2014): Land-use impacts on plant-pollinator networks: interaction strength and specialization predict pollinator declines. Ecology 95, 466–474. Weiner, C.N., Werner, M , Blüthgen, N. (in prep.): Land-use intensification triggers diversity loss in pollination networks: Regional distinctions between three different German bioregions Weiner, C.N., Hilpert, A., Werner, M., Linsenmair, K.-E., Blüthgen, N. -
12 Short Communication
J o u r n a l o f E n t o m o l o g i c a l S o c i e t y o f I r a n 11 2008, 27(2), Supplement, 11-14 Short communication The first report of three genera and fifteen species of Tephritidae (Diptera) from Iran E. Gilasian1&* and B. Merz2 1. Insect Taxonomy Research Department, Iranian Research Institute of Plant Protection, P.O. Box 1454, Tehran 19395, Iran, 2. Muséum d’Histoire Naturelle, C.P. 6434, CH-1211 Genève, Switzerland, E-mail: [email protected] ge.ch *Corresponding author, E-mail: [email protected] ƵŶǀƨģ ŻřƶƬǀŞƣƂƃƹžƴūƶƳƶŝƢƬƘŤƯžĮƯƶƳƺĭƵŵżƳŚěžƳŚƿřŻźǀƯƦƿŚƷšřźƄůƽƵŻƺƯŹŵŵƺūƺƯƽŚƷƶ ƳƺưƳƾſŹźŝƾƏ Hypenidium Loew Euleia Walker Tephritidae ƹ žƴºūƶºſƹŚºƷƶºƳƺĭƽƶºưƷƶºƧŶºƿŵźĭƾƿŚºſŚƴƃ ƽƵŵřƺƳŚºų Metasfenisca Hendel ŶƳƺƃƾ ƯƁŹřżĭƱřźƿřŻřŹŚŝƲǀƫƹřƽřźŝ The Tephritidae (= Trypetidae, Trupaneidae, Euribiidae) is a large family of acalyptrate Diptera with over 4300 species known worldwide. Most species are phytophagous and have prominently patterned wings (White, 1988). So they are economically important because of the damage they may cause in fruit plantations (Merz, 2001). Other species are important agents in biological control programs against weeds (White & Elson-Harris, 1992). This family is recognized by the following characters: medium or small sized flies; vertical plate usually dose not reach midpoint of frons and carries one or more orbital bristles; antennae with glabrous or plumose arista; wings usually with a pattern consisting of brown strips and spots, costal vein with two interruptions, one before humeral vein and one at place of ending of subcostal vein; abdomen in males with five and in females with six segments visible externally (Rikhter, 1989). -
Superfamilies Tephritoidea and Sciomyzoidea (Dip- Tera: Brachycera) Kaj Winqvist & Jere Kahanpää
20 © Sahlbergia Vol. 12: 20–32, 2007 Checklist of Finnish flies: superfamilies Tephritoidea and Sciomyzoidea (Dip- tera: Brachycera) Kaj Winqvist & Jere Kahanpää Winqvist, K. & Kahanpää, J. 2007: Checklist of Finnish flies: superfamilies Tephritoidea and Sciomyzoidea (Diptera: Brachycera). — Sahlbergia 12:20-32, Helsinki, Finland, ISSN 1237-3273. Another part of the updated checklist of Finnish flies is presented. This part covers the families Lonchaeidae, Pallopteridae, Piophilidae, Platystomatidae, Tephritidae, Ulididae, Coelopidae, Dryomyzidae, Heterocheilidae, Phaeomyii- dae, Sciomyzidae and Sepsidae. Eight species are recorded from Finland for the first time. The following ten species have been erroneously reported from Finland and are here deleted from the Finnish checklist: Chaetolonchaea das- yops (Meigen, 1826), Earomyia crystallophila (Becker, 1895), Lonchaea hirti- ceps Zetterstedt, 1837, Lonchaea laticornis Meigen, 1826, Prochyliza lundbecki (Duda, 1924), Campiglossa achyrophori (Loew, 1869), Campiglossa irrorata (Fallén, 1814), Campiglossa tessellata (Loew, 1844), Dioxyna sororcula (Wie- demann, 1830) and Tephritis nigricauda (Loew, 1856). The Finnish records of Lonchaeidae: Lonchaea bruggeri Morge, Lonchaea contigua Collin, Lonchaea difficilis Hackman and Piophilidae: Allopiophila dudai (Frey) are considered dubious. The total number of species of Tephritoidea and Sciomyzoidea found from Finland is now 262. Kaj Winqvist, Zoological Museum, University of Turku, FI-20014 Turku, Finland. Email: [email protected] Jere Kahanpää, Finnish Environment Institute, P.O. Box 140, FI-00251 Helsinki, Finland. Email: kahanpaa@iki.fi Introduction new millennium there was no concentrated The last complete checklist of Finnish Dipte- Finnish effort to study just these particular ra was published in Hackman (1980a, 1980b). groups. Consequently, before our work the Recent checklists of Finnish species have level of knowledge on Finnish fauna in these been published for ‘lower Brachycera’ i.e. -
Producing Sea Buckthorn of High Quality
Natural resources and bioeconomy studies 31/2015 Producing Sea Buckthorn of High Quality Proceedings of the 3rd European Workshop on Sea Buckthorn EuroWorkS2014 Naantali, Finland, October 14-16, 2014 Kauppinen Sanna, Petruneva Ekaterina (Eds.) Natural resources and bioeconomy studies 31/2015 Producing Sea Buckthorn of High Quality Proceedings of the 3rd European Workshop on Sea Buckthorn EuroWorkS2014 Naantali, Finland October 14-16, 2014 Kauppinen Sanna, Petruneva Ekaterina (Eds.) Natural Resources Institute Finland, Helsinki 2015 ISBN: 978-952-326-035-1 (Online) ISSN 2342-7647 (Online) URN: http://urn.fi/URN:ISBN:978-952-326-035-1 Copyright: Natural Resources Institute Finland (Luke) Authors: Kauppinen Sanna, Petruneva Ekaterina (Eds.) Publisher: Natural Resources Institute Finland (Luke), Helsinki 2015 Year of publication: 2015 Cover photo: Sanna Kauppinen Natural resources and bioeconomy studies 31/2015 Preface Producing sea buckthorn of high quality asks skills and knowledge in every step of the food chain from the field to the consumer. The 3rd European Workshop on Sea Buckthorn (EuroWorkS2014) was held in Naantali, Finland on 14th to 16th of October 2014 under the theme “Producing Sea Buckthorn of High Quality”. Conference concentrated on three topics that were recognized to be current under the theme: sea buckthorn fly, cultivation technology and standardization of sea buckthorn. A special attention was paid to sea buckthorn fly because of its rapid and destructive invasion to Europe. Protective measurements need to be studied fast to get this new pest under control. Also long-term strategies are needed in order to continue efficient berry production, also without pesti- cides. Dr. Ljubov Shamanskaja has a long research experience with sea buckthorn fly in Barnaul, Rus- sia, where the fly has been a problem over 20 years. -
Plant Diversity Has Contrasting Effects on Herbivore and Parasitoid
Received: 25 May 2016 | Revised: 1 May 2017 | Accepted: 8 May 2017 DOI: 10.1002/ece3.3142 ORIGINAL RESEARCH Plant diversity has contrasting effects on herbivore and parasitoid abundance in Centaurea jacea flower heads Norma Nitschke1 | Eric Allan2 | Helmut Zwölfer3 | Lysett Wagner1 | Sylvia Creutzburg1 | Hannes Baur4,5 | Stefan Schmidt6 | Wolfgang W. Weisser1 1Institute of Ecology, Friedrich-Schiller- University, Jena, Germany Abstract 2Institute of Plant Sciences, University of High biodiversity is known to increase many ecosystem functions, but studies investi- Bern, Bern, Switzerland gating biodiversity effects have more rarely looked at multi- trophic interactions. We 3Department for Animal Ecology I, University studied a tri- trophic system composed of Centaurea jacea (brown knapweed), its flower of Bayreuth, Bayreuth, Germany 4Abteilung Wirbellose Tiere, Naturhistorisches head- infesting tephritid fruit flies and their hymenopteran parasitoids, in a grassland Museum Bern, Bern, Switzerland biodiversity experiment. We aimed to disentangle the importance of direct effects of 5 Institute of Ecology and Evolution, University plant diversity (through changes in apparency and resource availability) from indirect of Bern, Bern, Switzerland effects (mediated by host plant quality and performance). To do this, we compared 6Bavarian State Collection of Zoology (ZSM), Munich, Germany insect communities in C. jacea transplants, whose growth was influenced by the sur- rounding plant communities (and where direct and indirect effects can occur), with Correspondence Norma Nitschke, Institute of Ecology, potted C. jacea plants, which do not compete with the surrounding plant community Friedrich-Schiller-University, Jena, Germany. (and where only direct effects are possible). Tephritid infestation rate and insect load, Email: [email protected] mainly of the dominant species Chaetorellia jaceae, decreased with increasing plant Present address species and functional group richness. -
Knowledge Gaps, Training Needs and Bio-Ecological Studies on Fruit-Infesting Flies (Diptera: Tephritidae) in Northern Ghana
University of Ghana http://ugspace.ug.edu.gh KNOWLEDGE GAPS, TRAINING NEEDS AND BIO-ECOLOGICAL STUDIES ON FRUIT-INFESTING FLIES (DIPTERA: TEPHRITIDAE) IN NORTHERN GHANA BY BADII KONGYELI BENJAMIN MASTER OF PHILOSOPHY IN ENTOMOLOGY UNIVERSITY OF GHANA, LEGON, GHANA THIS THESIS IS SUBMITTED TO THE UNIVERSITY OF GHANA, LEGON IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF DOCTOR OF PHILOSOPHY CROP SCIENCE (ENTOMOLOGY) DEGREE JULY, 2014 University of Ghana http://ugspace.ug.edu.gh DECLARATION I hereby declare that this thesis is the result of my own original research, and that it has neither in whole nor in part been presented for a degree elsewhere. Works of others which served as sources of information have been duly acknowledged by reference to the authors. Candidate ………………………… Badii Kongyeli Benjamin Principal Supervisor …………………. Co-supervisor ………………….. Prof. Daniel Obeng-Ofori Prof. Kwame Afreh-Nuamah Co-supervisor …………………… Dr. Maxwell Kevin Billah University of Ghana http://ugspace.ug.edu.gh ACKNOWLEDGEMENTS This thesis could not have been accomplished without the guidance of my dear supervisors and academic mentors. My supervisors (Prof. Daniel Obeng-Ofori, Prof. Kwame Afreh-Nuamah and Dr. Maxwell K. Billah) offered me the needed encouragement, support and guidance throughout the study. Also, Prof. Gebriel A. Teye (Pro-Vice Chancellor), Prof. George Nyarko (Dean, Faculty of Agriculture), Dr. Elias N. K. Sowley (Director, Academic Quality Assurance Directorate) and Dr. Isaac K. Addai (Head, Department of Agronomy) all of the University for Development Studies (UDS) approved of my leave of study, supported and encouraged me throughout my study. The Head of Department (Mrs. Dr C. -
Impact of Biological Control on Two Knapweed Species in British Columbia
Impact of Biological Control on Two Knapweed Research Report Species in British Columbia Don Gayton, FORREX & Val Miller, B.C. Ministry of Forests, Lands and Natural Resource Operations Abstract Diffuse and spotted knapweed ( Centaurea diffusa Lam and C. stoebe L.) are two closely re - lated invasives found in many parts of British Columbia’s Southern Interior, causing sub - stantial economic losses in rangelands. Beginning in 1970, the provincial government initiated a long-term biological control effort against the knapweeds, introducing 10 dif - ferent insect agents from 1970 to 1987. In an effort to evaluate the efficacy of the program, archival (1983–2008) data was amassed from 19 vegetation monitoring sites that contained knapweed. In 2010, these sites were relocated and re-monitored and cover values were an - alyzed. Diffuse knapweed showed significant declines at 14 of 15 sites; spotted knapweed declined at three of four sites. Possible alternative explanations for the decline are dis - cussed. Evidence strongly points to a suite of biocontrol agents (seed feeders and root feed - ers) as the primary drivers of knapweed decline in British Columbia’s Southern Interior. KEYWORDS : biological control; British Columbia; Centaurea ; knapweed; monitoring Introduction iffuse knapweed ( Centaurea diffusa Lam.) and spotted knapweed ( Centaurea stoebe L.) are two introduced, closely related invasive forbs. These species are most com - Dmon in the northwestern United States and in western Canada. Centaurea stoebe (also referred to as C. maculosa Lam. and C. biebersteinii DC) is particularly widespread, reported in 45 US states and all provinces of Canada (Marshall 2004; Zouhar 2001). The drought-tolerant C. diffusa has an altitudinal range of 150–900 m, whereas C.