An extremely heavy population of true armyworm (TAW) larvae was found in a field of cereal rye being cut between Strathroy and Parkhill yesterday. This is the second field that TAW have been spotted in the last few weeks; the first being in a YEN wheat field near Oil Springs, though the population was much […]
We are once again reaching out to see if anyone is interested in monitoring corn rootworm (CRW) through the CRW Trap Network this year. Monitoring with sticky traps can help you determine if you have a Bt resistant corn rootworm problem and it helps us keep track of where these problem fields are. It can […]
Vast amounts of nitrogen (N) exist in our soils in many different forms, but only nitrate (NO3–) and ammonium (NH4+) can be taken up via the plant roots. Most of the nitrogen in the soil is in the organic form, which much be broken down by micro-organisms to become plant available. Mineralization is the process […]
The 2025 Ontario corn hybrid DON screening trial report is now available under the corn section of GoCrops.ca (or also available HERE). Ontario corn hybrid DON screening trials were initiated by the Ontario Corn Committee in 2019 following high DON levels in the 2018 corn crop. Hybrid susceptibility is one of the greatest factors influencing […]
The Corn Rootworm Trap Network is 5 years old! We have learned a lot about corn rootworm populations here in Ontario and we value the efforts of all trap participants who have monitored sites each season. A special thanks goes to Dan Bihari, Senior GIS Specialist, OMAFA for maintaining the trap network platform and to […]
Planting In March 2025, Statistics Canada estimated Ontario farmers intended to plant 2.3 million acres of grain corn, 5% higher than the 5-year (2020-2024) average seeded acres of 2.2 million acres (OMAFRA Crop Statistics). Spring came early for many, but not all parts of the province in 2025. The first half of April delivered a […]
The 2025 Ontario Corn Committee (OCC) hybrid performance trials are now available at GoCrops.ca (Link HERE). Over past decades, Ontario’s average corn yields have increased around 2 bu/ac/yr. Staying current with new and competitive yielding hybrids is important. A key benefit of OCC trials is the ability to compare a large number of hybrids. These […]
OMAFA field crop specialists in collaboration with Grain Farmers of Ontario (GFO) and members of the Ontario Agri-Business Association (OABA) have completed the 2025 annual Ontario corn ear mould and DON mycotoxin survey. Corn ear moulds such as Gibberella and their corresponding mycotoxins occur every year in Ontario. These mycotoxins, particularly deoxynivalenol (DON, also referred […]
Simple Summary– about two days after pollination, or a day after fertilization, corn silks degrade and detach from ovules (potential corn kernels) and provide the earliest indication of successful pollination/fertilization– the “shake test” – peeling back ear husks, giving it a tap and observing how many silks remain attached – can quickly provide an indication […]
This article was written by Emma Peel, a summer research assistant with OMAFA assisting with corn research and extension projects during the summer of 2025. Emma is an agriculture student at the University of Guelph Background Provided we are always planting into moisture, there can be various acceptable depths to plant corn depending on your […]
A cooler than average start to the growing season has added some uncertainty to post-plant nitrogen fertilization strategies for Ontario corn producers. Soil supply of nitrogen to the corn crop is likely lower than normal due to reduced N mineralization from both soil organic matter and manure, and the Maximum Economic Rate of Nitrogen (MERN) […]
Have you been seeing increased corn rootworm pressure in your continuous corn fields over the last few years? Monitoring with sticky traps can help you determine if you have a Bt resistant corn rootworm problem and it helps us keep track of where these problem fields are. Thanks to GFO and ABSTC, we still have […]
This cooler, wet weather seems to have delayed plant growth but also has been ideal for pests to build in fields or do more feeding while the plant growth is slowed. Cereal aphids have been spotted in several fields from Harrow to Stratford. Though cereal aphids can often be found at low levels in cereals, […]
Black cutworm (BCW) and true armyworm (TAW) moths have been making their way into Ontario over the last few weeks. Black cutworm in particular have been arriving since mid April in southwestern Ontario, with trap counts increasing weekly. Shout out to our new northern Ontario trap participants at the New Liskeard, Thunder Bay and Emo […]
Introduction Gibberella ear rot concerns the industry because of DON concentrations. It is well known that DON concentrations are highly dependent on interactions among hybrids, pathogens, and the environment. Starting in 2019, the Ontario Corn Committee (OCC) refined protocols for testing hybrid sensitivity to DON accumulation with confidence based on an assessed risk. This inaugural […]