By Nathan Mueller
More than a few eastern Nebraska growers are considering planting winter wheat this fall. If you are one of those farmers, you should start planning or reviewing your 2018 corn and soybean herbicide programs with next fall in mind.
Many herbicides have rotation restrictions, the minimum time required after the herbicide application and before another crop can be planted. Any herbicide with a 4.5 month or longer rotation restriction applied in corn or soybean has the potential to injure winter wheat next fall and thus should not be used this spring. This is to safeguard against herbicide residual activity in the soil that could potentially damage winter wheat planted this fall.
For that field or fields where you intend to plant wheat this fall, here are some suggestions for your corn and soybean herbicide programs.
Corn Herbicide Programs
A variety of products that can be used after corn planting but before crop emergence will not affect winter wheat this fall because they have less than a four-month rotational restriction for winter wheat. They include: Acuron, Anthem Max, Balance Flexx, Callisto, Corvus, Hornet, Instigate, Outlook, Resicore, Sharpen, SureStart, and Verdict. All other products, especially those that contain higher rates of atrazine, should not be used as they have rotational restrictions longer that 4.5 months, some as much as two cropping seasons, so choose wisely. Likewise, check the rotation restrictions of herbicide products used for post-emergence applications in May and June.
Table 1. Examples of corn herbicides and rotation restriction to winter wheat.
Soybean Herbicide Programs
Pre-emergence soybean herbicides that are safe for winter wheat include: Afforia, Anthem Maxx, Authority Assist, Authority First or Authority Max, Authority XL, Envive, Enlite, Fierce, First Rate, Latir, Outlook, Pursuit, Torment, Valor, Valor XLT, Warrant, and Warrant Ultra. As we move into post-emergence products with residual during June, you need to check the label again for rotation restrictions.
Table 2. Examples of soybean herbicides and rotation restriction to winter wheat.
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