Many trees, shrubs, and other landscape plants were damaged by the widespread frosts and below-freezing temperatures experienced during the first week of May. There will likely be situations where people suspect this damage to be caused by herbicides applied to adjacent corn and soybean fields. Frost injury normally appears as blackening or browning of newly emerged leaves or needles. Less severely damaged leaves may be malformed. Injury will usually be uniform around the entire plant.
Iowa State University
Hartzler, Robert G., "Herbicide drift versus cold temperature injury" (2005). Integrated Crop Management News. 1425.
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