Using seasonal tillage in combination with cover crops as a biological method to control cutworms in organic cruciferous crops

Annabelle Firlej, researcher

Annabelle Firlej

Researcher, Ph.D.

450 653-7368
ext 363

Contact Annabelle Firlej
Maxime Lefebvre, research assistant

Maxime Lefebvre

Researcher, Ph.D.

450 653-7368
ext 321

Contact Maxime Lefebvre

Description

A number of vegetable crops, including crucifers, suffer severe damage from cutworms in the spring. Organic growers are running out of solutions for dealing with the situation. Little is known about the ecology of cutworms in the field and about sampling techniques for these pests. Although tests on weed incidence and ploughing have been conducted in Europe and elsewhere in North America, no one has, as of yet, carried out such studies in Québec. The goal of this project is to assess the extent to which cover crop ploughing and burying practices can limit the damage cutworms inflict on vegetable crops. First, we will conduct trials to determine the best caterpillar sampling technique (pitfall traps, bait traps, refuge traps, or soil sifting) and characterize the pest’s spatial distribution before and after planting the vegetable crop. The impact in the field of these cover crop destruction methods on the black cutworm and darksided cutworm populations will then be assessed:

  • fall ploughing (bare ground)
  • cover crop mown in the fall and residues incorporated in the spring
  • cover crop mown and partially incorporated in the fall
  • cover crop mown and fully incorporated in the fall

The effect of these treatments on the abundance and spatial distribution of cutworms in cabbage plots will shed light on which practice provides the most satisfactory control of cutworms in organic vegetable production.

Objective(s)

  • Determine the best sampling technique in the fields and hedgerows from among four techniques, and characterize the spatial distribution of the caterpillars before and after planting the vegetable crop.
  • Assess the effect in the field of three cover crop destruction methods on both the black cutworm and darksided cutworm populations.

From 2020 to 2023

Project duration

Market gardening

Activity areas

Pest, weed, and disease control, Organic farming

Services

This work will help organic growers limit the damage cutworms inflict on vegetable crops.

Partner

Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec

This may interest you

2017-2018 • Market gardening

Potato fertigation using a drip irrigation system

The aim of this project was to leverage the efficiency of drip irrigation and splitting nitrogen inputs into multiple applications to reduce total nitrogen inputs per unit produced and provide better economic and environmental alternatives to conventional irrigation.

Researcher: Carl Boivin

Read more about the project

Carl Boivin
2017-2018 • Market gardening

Field trials on swede midge mating disruption

This project will compare the ability of various pheromone mixes to prevent male swede midges from locating females.

Read more about the project

2019-2022 • Market gardening

Developing mass trapping strategies to control the striped cucumber beetle in organic cucurbit farming

This project aims to develop mass trapping strategies to keep damage caused by the striped cucumber beetle populations below the economic threshold, while minimizing the capture of pollinators and natural enemies.

Read more about the project

Annabelle Firlej
Maxime Lefebvre