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Poster

Plant-Insect Ecosystems

P-IE: IPM

D3309: Evaluation of different strategies to manage the potato leafhopper (Emposaca fabae) in alfalfa in Quebec, Canada

Tuesday, November 7, 2023
9:00 AM - 6:30 PM ET
Location: Prince George's Exhibit Hall BCD
In-Person Poster

    Presenting Author(s)

  • Julien Saguez

    Researcher - Field Crop Entomologist
    CÉROM - Centre de recherche sur les grains
    Saint-Jean-sur-Richelieu, Québec, Canada

    • Co-Author(s)

  • XS

    Xiawei Shi

    McGill University
    Sainte-Anne-de-Bellevue, Québec, Canada

  • HM

    Huguette Martel

    Ministère de l'Agriculture, des Pêcheries et de l'Alimentation
    Sherbrooke, Québec, Canada

  • AC

    Annie Classens

    Agriculture and Agri-Food Canada
    Québec City, Québec, Canada

  • PS

    Philippe Séguin

    McGill University
    Sainte-Anne-de-Bellevue, Québec, Canada

The potato leafhopper, Empoasca fabae (Harris) affects several crops including alfalfa (Medicago sativa L.). This pest is a frequent problem in several regions of Quebec (Canada), inducing direct damage on plants and reducing yields. The objective of this study is to evaluate different strategies (insecticides and tolerant cultivars) to manage this pest.

Experiments are conducted at two sites in Quebec over three field seasons. Foliar insecticide applications are applied when economic thresholds are reached and several tolerant cultivars are compared.

Insecticide applications reduced PLH populations and increased yield by 7% the year following application. Differences in forage yields between PLH-tolerant and PLH-susceptible cultivars were not significant regardless of the level of infestation.

Preliminary results suggest that foliar insecticide applications could be a more effective way to reduce PLH populations than PLH-tolerant cultivars. However, more research is required to confirm these results.