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Susceptibility of iris (Iridaceae) to larval infestation by Neorthacheta dissimilis (Diptera: Scathophagidae)

Published online by Cambridge University Press:  01 December 2021

Josée Doyon Open the ORCID record for Josée Doyon [Opens in a new window] ,
Jade Savage ,
Stéphane Bailleul ,
Stéphane Labelle  and
Jacques Brodeur
Josée Doyon*
Affiliation:
Institut de Recherche en Biologie Végétale, Département de sciences biologiques, Université de Montréal, 4101 rue Sherbrooke Est, Montréal, Québec, H1X 2B2, Canada
Jade Savage
Affiliation:
Department of Biological Science, Bishop’s University, 2600 rue du Collège, Sherbrooke, Québec, J1M 1Z7, Canada
Stéphane Bailleul
Affiliation:
Jardin Botanique de Montréal, Espace pour la vie, 4101 rue Sherbrooke Est, Montréal, Québec, H1X 2B2, Canada
Stéphane Labelle
Affiliation:
Biodôme de Montréal, Espace pour la vie, 4777 Pierre-De-Coubertin, Montréal, Québec, H1V 1B3, Canada
Jacques Brodeur
Affiliation:
Institut de Recherche en Biologie Végétale, Département de sciences biologiques, Université de Montréal, 4101 rue Sherbrooke Est, Montréal, Québec, H1X 2B2, Canada
*
*Corresponding author. Email: j.doyon@umontreal.ca
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Abstract

Neorthacheta dissimilis Malloch (Diptera: Scathophagidae) is a poorly known scathophagid fly that feeds and develops on iris (Iridaceae). A survey of its occurrence was performed at the Montréal Botanical Garden (Montréal, Québec, Canada) in 2018, 2019, and 2020. Iris species and cultivars from two subgenera, Iris and Limniris, were evaluated for larval infestation. When pooled for subgenera and years, data from 18 Iris classes revealed high levels of infestation per flower stalk, ranging from 34% to 100%. When analysed per bud or flower, levels of infestation remained high, ranging from 19% to 100%, but generally was lower than for flower stalks as the unit of replication. The mean number of N. dissimilis larvae per infested flower or bud was higher for the subgenus Limniris (1.13) than for the subgenus Iris (1.03), with a maximum of four N. dissimilis larvae per flower being observed. These figures are worrying for horticulturalists because the insect is prevalent and causes either abortion or aesthetic damages to iris flowers.

Type
Research Paper
Information
The Canadian Entomologist , Volume 154 , Issue 1 , 2022 , e5
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Entomological Society of Canada

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Footnotes

Subject Editor: Julia Mlynarek

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