Weed-free fields in early spring significantly improve planting conditions while also reducing moisture and nutrient loss. With time in short supply, and the ever-present possibility of uncooperative weather, getting pre-seed weed control products on the ground isn't always easy. Fall herbicide application can be an effective and flexible alternative.

Tough perennial weeds like dandelion and narrow-leaved hawk’s beard thrive as spring arrives, and become ever-harder to control as they increase in size. Overall, that translates to significant competition for moisture and nutrients.

As described by University of Nebraska-Lincoln extension resources, the loss of large quantities of soil moisture in spring leads to crop germination delays and uneven establishment. The harbouring of insects and diseases is also a significant problem.

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Fall applied herbicides are a great way to reduce the weed seed bank, preserve moisture and nutrients, fight herbicide resistance, and give crops a better chance in the early growing season. Following a few best management practices can ensure your herbicide program goes even further.

From excess moisture to vigorous, early-emerging weeds, spring conditions won't always cooperate with your growing strategy. Time – the ultimate commodity – can also be in short supply. Applying herbicides in the fall, however, can alleviate early-season pressure. Indeed, doing so can add distinct advantages to your growing program.

What fields are high risk?

The cornfields that are most at risk for WBC infestations are those that are at pre-tassel to full tassel during peak flight of the female WBC moths. Female WBC moths preferentially lay their eggs on corn that has a fresh tassel. If they are at peak flight and a corn field is before or after tassel they will move on to another corn field or to a dry bean field. 

Western Bean Cutworm (WBC) infestations tend to be patchy and sporadic in many fields, therefore careful monitoring is required to determine if an insecticide application is needed. 

Since its arrival in Ontario in 2008, Western bean cutworm (WBC) has become the single most important insect pest in field corn. The movement of this pest is pushing eastward each year, making it a concern for most field corn acres in Canada. The first step to tackling this emerging threat is to understand its lifecycle and the potential damage it can cause.