首页|New Ontario records for Nanophyes m. marmoratus (Goeze, 1777) (Coleoptera: Brentidae), introduced into North America for classical biological control of purple loosestrife.
New Ontario records for Nanophyes m. marmoratus (Goeze, 1777) (Coleoptera: Brentidae), introduced into North America for classical biological control of purple loosestrife.
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This study is the first to monitor the spread of N. marmoratus marmoratus (Nmm) in Canada since its release in North America, thus addressing Corrigan et al.'s (2013) recommendation to assess its establishment in Canada. In 2012 and 2013, several Purple Loosestrife (Lythrum salicaria) populations in eastern Ontario were surveyed. Only the well-established, leaf-feeding Neogalerucella beetles were expected to be found but Nmm was repeatedly discovered as well on Purple Loosestrife flowers from mid-June to late August. Nmm has now been identified at 18 sites in eastern Ontario and quantified in 14 of them. The average density was 0.78(+or-0.55) weevils per stem (n=513 stems), with a range of 0-14 weevils per stem. In populations where Nmm is common, Purple Loosestrife fruit densities were noticeably lower, with higher proportions of aborted seed pods. Flower bud abortion was often seen on the lower half of the inflorescence with many to all of the buds along this section missing. Affected buds that remain on plants each had a single small exit hole. In the 14 sites with Nmm, reductions in reproductive output were measured as the portion (%) of the total lengths of inflorescences bearing aborted flower buds. These reductions averaged 12.6% (+or-10.6%) with a range of 0-34.5% over all sites. When considering only the damaged plants (n=85) within the sites, total reproductive output reductions averaged 53%(+or-26.2%) with a range of 0-100%.
St. Louis, E.
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Faculty of Science, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
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