Controlling Volunteer Corn In Soybeans

Jul 04, 2014

Postemergence grass herbicides offer control of volunteer corn.

As the soybean crops continue to mature, volunteer corn is rearing its head in some fields. We assume that most of the volunteer corn is glyphosate- and glufosinate-resistant so we will not spend time going over all the options for killing the various types of volunteer corn. In general, the most logical choices to control volunteer corn in any kind of soybean are the post-grass herbicides (e.g., Assure II, Select, clethodim, Fusilade, etc.). Below are some rates to consider depending on the height of the volunteer corn.

Always include the necessary adjuvants otherwise control will be impacted. In most cases, this will require the addition of a crop oil concentrate (COC) or methylated seed oil (MSO). If crop injury is a concern, a nonionic surfactant (NIS) may be used in place of an oil with Select Max only. Keep in mind if you plan to tank-mix a broadleaf-specific herbicide, the rate of the grass herbicide may need to be increased to overcome possible antagonism.

Product	Volunteer corn height	Rate/acre
Select Max 0.97EC	<12 inches	6 fl oz
	12-24 inches	9 fl oz
Clethodim 2EC	4-12 inches	4 fl oz
	12-18 inches	6 fl oz
Assure II/Targa 0.88EC	10-12 inches	4 fl oz
	12-18 inches	5 fl oz
	18-30 inches	8 fl oz
Fusilade DX 2EC	<12 inches	4 fl oz
	12-18 inches	6 fl oz

Source : psu.edu

Video: Independent Seed, National Impact | On The Brink: Episode 9

A survey of 200 independent seed businesses reveals what Canada's seed sector actually contributes — and what it stands to lose.

On the Brink, Justin Funk, a third-generation agri-marketer, shares the findings of a national survey conducted in early 2026. The numbers reframe the conversation: independent seed companies in Canada represent upwards of $1.7 billion in dedicated seed infrastructure, approximately 3,000 full-time equivalent jobs in rural communities, and an estimated $20 million in annual community contributions. And roughly 90% of Canada's cereals, pulses, and other small pollinated crops flow through them.

The survey also asked how dependent these businesses are on public plant breeding to survive. The answer was unambiguous. For policymakers evaluating the future of publicly funded breeding programs, Funk argues the economic case for this sector and the case for public plant breeding are the same argument.

On the Brink is a cross-country video series exploring the future of plant breeding in Canada. Each episode features voices from across the industry in an open, ongoing conversation about innovation and long-term investment in Canadian agriculture.