Ontario Agriculture

The network for agriculture in Ontario, Canada

Black Cutworm Fact Sheet from OMAFRA

An unseasonably early tornado season in the U.S. Midwest has blown a potentially big black cutworm problem to southern Ontario farms. 


Scientific Name
Agrotis ipsilon

Identification

  • Black cutworm larvae are greyish-black with a paler underside 
  • Mature larvae are about 5 cm (2 in.) long
  • The larvae are soft and fat, and they roll up when disturbed 
  • Early-season cutworms attack the seedling plants, usually cutting them below or at the soil surface 
  • A single larva may destroy several seedlings

Often Confused With
Wireworm damage
Damping-off

Period of Activity
Warm, clear, calm nights in early spring are ideal for moths to lay eggs. Feeding occurs from early May through to mid-June. Larval activity usually coincides with early season planting and emergence.  Damage is often sporadic and appears in localized areas within a field. Most species of cutworms feed at night, hiding during the day under loose stones or in the soil near the base of the plant. Plants are most vulnerable to cutworm losses shortly after transplanting.

Scouting Notes
While walking fields, keep an eye open for wilted plants or stems that have been severed at the soil level.  Dig around the damaged plant to look for the cause of the damage.  If a cutworm is uncovered, take note of its size.  Record the percentage of wilted or cut plants within the field.

Thresholds
For most vegetable crops, the control guideline is 5% damaged plants. Small larvae (less than 1 cm or 3/8 in.) are easier to control. Large larvaestop feeding as they prepare to pupate.  Control of these large larvae is usually unnecessary.

Check the OMAFRA fact sheet at: http://www.omafra.gov.on.ca/IPM/english/peppers/insects/black-cutwo...

Views: 482

Comment

You need to be a member of Ontario Agriculture to add comments!

Join Ontario Agriculture

Agriculture Headlines from Farms.com Canada East News - click on title for full story

Tariff tools

Multiple tools are available to help Canadians determine tariff levels and what goods may cost

Premier Ford names new ag minister in cabinet shuffle

Sam Oosterhoff takes over for Trevor Jones

Restoring property rights for Alberta farmers

This fall, Alberta’s government will remove Water Act approval requirements for routine agricultural activities involving ephemeral water bodies and temporary and seasonal wetlands on private cropland. “Farmers should not have to spend thousands of dollars and wait on government approval to carry out routine work on their own land. We are restoring private property rights and getting government out of the way where it doesn’t need to be. These common-sense changes will save farmers time and money and give them greater control over how they manage their own property.” Grant Hunter, Minister of Environment and Protected Areas The changes respond directly to concerns raised by Alberta farmers and agricultural organizations about unnecessary regulatory burden. Under the current system, routine farming activities can trigger regulatory requirements if they affect a temporary or seasonal wetland. In some cases, a farmer may have to hire a qualified wetland professional, complete an assess

Minister MacDonald announces initial list of 2026 Livestock Tax Deferral regions

Canadian producers and ranchers are on the front lines of climate change, and its effects can significantly impact operations. When extreme weather strikes, livestock producers may experience forage shortfalls and need timely information and support to make effective herd management decisions. Today, the Honourable Heath MacDonald, Minister of Agriculture and Agri-Food, announced an initial list of regions that will qualify for Livestock Tax Deferral in 2026 due to extreme conditions. The Livestock Tax Deferral provision allows livestock producers in prescribed areas, who are forced to sell all or part of their breeding herd due to forage shortfalls resulting from drought, excess moisture or flooding, to defer a portion of their income from sales until the following tax year. The income may be at least partially offset by the cost of reacquiring breeding animals, helping to reduce the tax burden of the original sale. Since 2024, regions that are nearby to drought, excess moisture or

Extinguishing the risk of combine fires

It only takes a small spark to potentially turn a productive harvest day into a costly and dangerous situation. That’s why proactive combine maintenance and fire prevention, both before and during harvest, are essential for preventing machinery fires, which can jeopardize land and lives. Think taking a bit of time during harvest to inspect and clean combines creates costly delays? The reality is that skipping routine maintenance could have significantly higher cost implications if a combine fire were to damage crops or equipment or cause physical injuries. Crop residue, heat, and dry conditions that are typically present during harvest can unfortunately create a perfect storm for combine fires. And considering that some combines can hold upwards of 1,500 litres of fuel, combine fires are a significant hazard during the harvest season that should never be overlooked. Fortunately, combine fires are often preventable with proactive maintenance, a safety mindset, and fire awareness. B

© 2026   Created by Darren Marsland.   Powered by

Badges  |  Report an Issue  |  Terms of Service