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With the cool and wet weather we have experienced lately, there are a lot of soybeans under stress as they emerge.
There tends to be a "pile on effect" when this happens, and many want to find the straw that broke the camels back, but it is hard to assess blame as weaker plants with one issue will always be
more susceptible to any of the additional stresses listed below:
1. Soybean Diseases: See article links below from Iowa State and U of MN.
2. Cold and wet weather causing delayed emergence. Attached are some photos of a soybean field in central
MN that was planted on April 17; and it finally emerged on May 15th. The plants that emerged are under stress with chlorotic cotyledons (remember the cotyledons serve as the main energy supply
until V1), and also some purple and elongated hypocotyls.
3. Herbicides: Plants under stress may be affected more by herbicides than healthy plants. The PPO herbicides ( Valor containing products such as Valor SX and Fierce, Authority containing products such as Sonic and Authority Brands, and Kixor containing products such as Sharpen, OpTill, and Verdict) can cause some necrotic tissue burn to the crook or cotyledons, especially when heavy rain causing splashing soil to deposit on the green tissue. The photo attached is an example of injury when the crook of the soybean is at the soil surface or partially emerged at the time of application.
4. ILeVO Seed Treatment Halo Effect Injury (This is a new one, but something to watch for). ILeVO, a new seed treatment from Bayer that is being touted for SDS control, consistently causes what is being called a "halo effect on the cotyledons and many times chlorotic unifoliate leaves. For more information, see the attached pdf from Mershman Seed.