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Volunteer corn can cause a number of issues in a corn and soybean rotation and, most importantly, can cause potential yield loss. When kernels or ears from your combine are dropped during corn harvest, they will overwinter in your field, then germinate in the spring and ultimately compete with your newly planted crop.
That’s why management of volunteer corn is critical to any operation and why volunteer corn is considered a weed.
Volunteer corn refers to corn plants that grow unintentionally from seeds left in the field after the previous year's harvest. These plants emerge in subsequent crops, often as weeds, and can compete with the intended crop for resources.
Volunteer corn is a problem because it competes with crops for moisture, nutrients, and light. The glyphosate-tolerant gene in most corn and soybeans is passed on to the grain produced, making it glyphosate tolerant as well.
This makes continuous corn production difficult in high volunteer corn situations where there is no selective herbicide available to accomplish killing volunteer corn without also killing the corn crop. In some cases, tillage may be the best and only solution.
If volunteer corn is left in soybeans, rootworm beetles can be attracted to the volunteer corn and lay eggs in the soil, eliminating the value of rotation control for corn rootworm the following year. If volunteer corn is left in corn, first generation European Corn Borer (ECB) feed inside stalks and may cause stalk breakage at or before harvest. Second generation ECB feed on ear shanks that may cause ear droppage from the stalk before harvested. Rootworms feeding on roots will cause corn plants to lodge (when the corn stalk breaks or is displaced), making harvest difficult and causing possible ear loss.
Diseases can also develop in volunteer corn, producing more disease inoculum (the individual part of the pathogen that actually causes disease within the host), resulting in greater disease pressure the following year when a new corn crop is planted. It can also lead to stalk lodging, resulting in corn ear losses.
Select a good disease resistance package with hybrids that contain traits for rootworm control on continuous corn fields, or use an in-furrow insecticide at planting. Select hybrids with traits that offer ECB control and with good standability and ear retention.
Scout fields for disease presence and apply fungicide when needed to maintain plant health until maturity.
Monitor your combine closely and adjust where needed to avoid grain loss in the field.
Harvest before wind and moisture reduce stalk integrity and lodge corn plants, and when proper moisture content can help to prevent grain shattering in the combine.
Avoid tillage that will spread the grain lost and instead consider tillage in the fall, if part of your operational practices.
In soybean production, several chemistries can be applied to kill volunteer corn, even though it is glyphosate tolerant, such as foliar grass control products like clethodim.
By treating volunteer corn in soybeans early, you can reduce plant competition for fertilizer, water, and sunlight, and possibly allow for lower rates of herbicides usage. Rates change according to the size and stage of volunteer corn to be controlled. By waiting to treat later, you may have given up yield that cannot be recovered.
When selecting products to control volunteer corn, always read and follow label use directions. Adjuvants are an important ingredient when controlling volunteer corn and vary among the products being used.
FBN® offers a wide of crop protection products, including clethodim, that can be used to address volunteer corn. With a convenient online platform, transparent pricing, and direct-to-farm delivery available on your schedule, FBN puts Farmers First®.
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