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51 Leucanthemum Vulgare Lam., Oxeye Daisy (Asteraceae) Chapter 51 337 Miller, R.R., Svejcar, T.J., Rose, J.A. and McInnis, M.L. (1994) Plant development, water relations, and carbon allocation of heart-podded hoary cress. Agronomy Journal 86, 487–491. Mulligan, G.A. and Findlay, J.N. (1974) The biology of Canadian weeds. 3. Cardaria draba, C. chalepensis, and C. pubescens. Canadian Journal of Plant Science 54, 149–160. Redfern, M. and Shirley, P. (2012) Checklist of British Galls. Available at: http://www.british-galls. org.uk/index.htm (accessed 2 February 2012). Selleck, G.W. (1965) An ecological study of lens- and globe-podded hoary cresses in Saskatchewan. Weeds 13, 1–5. Sheley, R.L. and Stivers, J. (1999) Hoary Cress (Whitetop). In: Sheley, R.L. and Pertroff, J.K. (eds) Biology and Management of Noxious Rangeland Weeds. Oregon State University Press, Corvallis, Oregon, pp. 401–407. Skinner, K., Smith, L. and Rice, P. (2000) Using noxious weed lists to prioritize targets for developing weed management strategies. Weed Science 48, 640–644. Van den Berg, C. and van de Sande, J.C. (1999) Ceutorhynchus turbatus new for the Netherlands (Coleoptera: Curculionidae). Entomologische Berichten 59, 157–159. 51 Leucanthemum vulgare Lam., Oxeye Daisy (Asteraceae) Alec S. McClay,1 Sonja Stutz2 and Urs Schaffner2 1McClay Ecoscience, Sherwood Park, Alberta; 2CABI, Delémont, Switzerland 51.1 Pest Status by seed, and individual plants expand by rooting at the stem bases and by rhizome Leucanthemum vulgare Lamarck (=Chrys- spread (Clements et al., 2004). Leuc- anthemum leucanthemum L.) (Asteraceae) anthemum vulgare was reported to be is a shallow-rooted perennial herb native to naturalized in Quebec by the 18th century Europe. It has a short creeping rootstock (Lavoie et al., 2012). It is widespread that gives rise to erect, simple or slightly across Canada, occurring in all provinces branched stems usually up to 90 cm in and in the Yukon Territory (Clements et al., height, generally one to two per plant but 2004; Bennett and Mulder, 2009) and also sometimes forming larger clumps. Leaves throughout the USA, although less frequent are spatulate or obovate at the base of the in southern states (Strother, 2006; USDA- plant and ligulate higher on the stem. The NRCS, 2012). Some authors separate the fl ower head is a daisy, 2.5–7.5 cm in tetraploid Leucanthemum ircutianum DC. diameter, with a yellow central disk and from the diploid L. vulgare, and AFLP white rays. Leucanthemum vulgare spreads analysis of European material suggests that © CAB International 2013. Biological Control Programmes in Canada 2001–2012 (eds P.G. Mason and D.R. Gillespie) 338 Chapter 51 L. ircutianum is a hybrid of L. vulgare and industrial and other non-crop areas in another, unknown, diploid parent (Ober- Canada. Clements et al. (2004) report prieler et al., 2011). Both diploids and several other herbicides that are effective tetraploids occur in North America on L. vulgare but point out that most of (Clements et al., 2004), but preliminary these will also eliminate legumes and other results on a number of North American desirable broad-leafed species in pastures. populations suggest that most of them are Fertilizing pastures can also be effective in diploid (Stutz et al., 2012). suppressing L. vulgare by stimulating the Leucanthemum vulgare is primarily a growth of grasses and other competing weed of pastures, rangelands and roadside vegetation (Olson and Wallander, 1999; areas, and can form very dense, extensive Clements et al., 2004). populations in pastures, where it is Leucanthemum is a European genus of generally avoided by grazing cattle, and 41 species, most of which, except for the promotes soil erosion because of its widespread L. ircutianum and L. vulgare, shallow root system. Overgrazing often have quite limited distributions in Europe promotes infestations of L. vulgare (Greiner et al., 2012). It belongs to the tribe (Clements et al., 2004). It is usually not Anthemideae and the subtribe Leuc- considered a problem in annual crops, antheminae, which has no native North although it was the fourth most abundant American species (Oberprieler et al., 2009), weed species in a survey of spring cereals so L. vulgare is taxonomically well isolated in New Brunswick in 1986–1987 (Thomas from potential native non-target species. et al., 1994). It is of major concern as a The main non-target taxon of concern is contaminant in grass seed production in the popular horticultural Shasta daisy, the Peace River region of British Columbia Leucanthemum × superbum (Bergmans ex (British Columbia Ministry of Agriculture, J.W. Ingram) D.H. Kent (Asteraceae), a Food and Fisheries, 2002) and cannot be hybrid introduced by the famous American separated from seed of timothy, Phleum plant breeder Luther Burbank in 1901 pratense L. (Poaceae) (Manitoba Agri- (Hawke, 2007). According to Burbank culture, Food and Rural Initiatives, 2012). (1914) its parentage included three Euro- Leucanthemum vulgare is an invasive pean Leucanthemum species, L. vulgare, L. species of concern in natural areas, such as maximum (Ramond) DC. and L. lacustre Riding Mountain National Park, Manitoba (Brot.) Samp. (Asteraceae) and the (Otfi nowski et al., 2007) and Yellowstone Japanese Nipponanthemum nipponicum National Park, USA (Olliff et al., 2001). It is (Franch. ex Maxim.) Kitam (Asteraceae). listed as a provincial noxious weed in However, given that Burbank ‘kept no Alberta, Saskatchewan and Manitoba, and systematic records’ and had ‘unorthodox as noxious in the Cariboo, North Okanagan, views of heredity’ (Crow, 2001), the true Thompson-Nicola and Peace River regions parentage of Shasta daisy must be of British Columbia. Leucanthemum considered unclear. For example, Tahara vulgare is a ‘primary noxious weed seed’ (1921) disputes Burbank’s identifi cation of under the Canada Seeds Act, and there is a N. nipponicum and suggests that the zero tolerance for oxeye daisy seed in most species he used was probably Arct- grades of most seed species sold in Canada anthemum arcticum (L.) Tzvelev (Minister of Justice, 2005). (Asteraceae). Numerous varieties of Shasta daisy are available, most of which fall within L. × superbum but a few of which 51.2 Background are probably selections of L. vulgare (Hawke, 2007). It will be necessary to test a Several herbicides containing amino- range of Shasta daisy cultivars to assess pyralid or aminopyralid + metsulfuron- possible risk to this horticultural plant methyl are currently registered for control from potential biological control agents for of L. vulgare in rangeland, pasture, L. vulgare. Chapter 51 339 Natural enemies of L. vulgare in North sidered as potential biological control America have not been surveyed in detail. agents based on records of their restricted Guillet and Arnason (1995) found the host range: the root-mining moths polyphagous species Argyrotaenia velu- Dichrorampha aeratana (Pierce & Metcalfe) tinana Walk. and Sparganothis sulfureana and D. baixerasana Trematerra, the shoot- (Clemens) (Lepidoptera: Tortricidae) feed- mining moth D. consortana Stephens ing on L. vulgare fl ower heads around (Lepidoptera, Tortricidae), the root-feeding Ottawa, Ontario. The fl ower-head feeding weevils Cyphocleonus trisulcatus (Herbst) weevil Microplontus campestris (Gyllen- and Diplapion stolidum (Germar) (Cole- hal) (=Ceutorhynchus campestris Gyllen- optera, Brentidae) and the fl ower-head hal) (Coleoptera: Curculionidae) has been attacking fl y Tephritis neesii Meigen collected in Ontario on several occasions (Diptera, Tephritidae). since 1971 (Anderson and Korotyaev, Initial in-depth studies on the biology, 2004). Macrosiphoniella leucanthemi host-range and impact of biological control Ferrari and M. sanborni (Gillette) (Hem- candidates focused on D. aeratana, which iptera: Aphididae) are recorded feeding occurs throughout western and central on L. vulgare in North America (Miller Europe. The larvae of D. aeratana feed and Stoetzel, 1997; Stoetzel and Miller, mainly inside the roots, where they also 1999). overwinter. Around March–April, they leave the roots and pupate in the soil. Adult D. aeratana, which have brownish 51.3 Biological Control Agents forewings and a wingspan of 12–16 mm, fl y in May and June. They live for Foreign explorations started in 2008 with approximately 1 week and females lay literature and fi eld surveys. In total, at least about 100 eggs. First results from no-choice 80 insects, 7 nematodes and 16 fungi were larval development tests indicated that the found to be associated with oxeye daisy in fundamental larval host range of D. its native range (Schaffner et al., 2008). aeratana is mainly restricted to the genus Particularly well represented is the genus Leucanthemum, the larvae being able to Dichrorampha (Lepidoptera, Tortricidae), develop on L. vulgare, L. ircutianum and which appears to have undergone speci- on Shasta daisies. A few larvae were also ation on L. vulgare and related plants; in found on other test plant species, but it total, some 15 Dichrorampha spp. have remains to be shown whether the larvae been recorded from Leucanthemum spp. were indeed D. aeratana or whether they (Razowski, 2003). The fl ower head-attack- belonged to other Dichrorampha spp. ing weevil M. campestris was originally (Stutz et al., 2012). Under multiple-choice identifi ed as a potential candidate bio- conditions, L. vulgare and L. ircutianum logical control agent. Adults of this species were attacked signifi cantly more often than start feeding in late April, and mating and Shasta daisies (S. Stutz and U. Schaffner, oviposition into the fl ower heads was Delémont, Switzerland, 2012, unpublished observed from mid-May onwards. Obser- data). vations made during the fi eld surveys and The root-feeding weevil C. trisulcatus, in the laboratory confi rmed that larval which has a scattered distribution through- feeding is restricted to the receptacle and out Europe (Dieckmann, 1983), was also that seeds were not attacked. As a identifi ed as a promising potential bio- consequence, attack by M. campestris was logical control agent in the initial literature shown to have no or minimal impact on survey (Schaffner et al., 2008).
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