Frost Injury in Sorghum Species

sorghum-sudangrass after a frost

Caution! Members of the sorghum family – sorghum, sudangrass, and hybrid sorghum-sudangrass – contain dhurrin, a glucoside that breaks down to release hydrocyanic acid, also known as prussic acid (hydrogen cyanide, HCN). A sudden disruption of growth such as frost, drought or cutting, causes prussic acid to be released inside the plant at a more […]

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Crop Report – Week of September 18th, 2023

The headlands of this field received a fall application to control dandelions, making for a nice seed bed to plant into. The rest of the field had no fall management, and the dandelion pressure is significant and will take much longer to control now.

Three tips for weed management this fall. Reflecting on some of the weed control issues that came up this past spring, below are three key items where management activities this fall can significantly improve control and/or financial return next season. 1. Fall management provides better dandelion control. In the fall, resource allocation of perennial weeds […]

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Planting Date Matters

map depicting the optimum planting dates for winter wheat across Ontario

By: Joanna Follings and Emma Dieleman Ontario’s winter wheat planting recommendations were established in the 1990s using research trials conducted across the province. This research led to the development of the Ontario winter wheat planting date map (Figure 1). This research found that by every day planting is delayed beyond the optimum planting date for […]

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Fall Rest Period for Alfalfa

Key Points When is the fall rest period? The fall rest period (sometimes called “critical fall harvest period”) for alfalfa is 450 growing degree days, base 5°C — or approximately 6-weeks — before the average date of the first killing frost (-4°C for several hours), when alfalfa stops growing. Not cutting during this period allows […]

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Scout Bt Corn for Signs of ECB Injury

In case you missed it, we announced earlier this year that ECB populations were found in Nova Scotia in the fall of 2022 that are resistant to Cry1Ab Bt protein used to control ECB in Bt corn. Given the level of injury found, the resistance was developing over a number of years and went unnoticed. […]

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Palmer amaranth found in Ontario

It was only a matter of time before Palmer amaranth was found on a farm in Ontario. Although technically it was found back in 2007 along a rail line outside of Niagara Falls, surveillance of that area in the years following have never detected any plants since the initial finding. In late summer, an individual […]

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Crop Report – Week of August 7th, 2023  

Figure 1. Good soil structure (a, left) vs. poor soil structure (b, right).

Identifying and Addressing Soil Structure Challenges   A well-structured soil improves water infiltration, air exchange, rooting, and ultimately crop yield. On the other hand, a cloddy, dense, or compacted soil may result in ponding, nutrient losses, and restricted root systems. Poor soil structure contributes to lower crop yields, especially in seasons that are either too dry […]

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Crop Report – Week of July 31st, 2023

Figure 1. Cover crop biomass harvested from a 0.25m2 area for tissue analysis.

Managing Cover Crop Nitrogen / Residue Breakdown Across Ontario, wheat harvest continues, opening the best window for planting cover crops in most field crop rotations. You can find more information on the  2023 winter wheat quality update and achieving success with cover crops after wheat at But can those cover crops be managed to […]

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