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| Glyphosate applied postemergence to or drift on non-resistant varieties | |||||
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| Glyphosate (Roundup® and others) injury will appear as wilting, yellowing and stunting. Newly emerged leaflets may be deformed. Injury may lead to plant death. If the plant survives, yield reductions are possible, especially if plant height is reduced. | |||||
| Glyphosate applied postemergence to resistant varieties | |||||
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Many soybean varieties (Roundup Ready®) have been developed using a biotechnology trait that confers resistance to glyphosate (Roundup® and others). Injury to Roundup Ready soybean appears as a yellow or lemon-lime green color of newly
emerging trifoliolates following a glyphosate application. Typically, the veins of the affected leaf remain green and the yellowing is more or less uniformly distributed across the leaf surface. Some varieties have less tolerance to glyphosate than other varieties. In addition, if the crop is under stress from disease, insect feeding, nematodes, drought, excessive rainfall, or injury from other herbicides, it will not be able to metabolize glyphosate as quickly and soybean will show injury symptoms. The injury is transitory in nature and usually not present 10 to 14 days after application unless the plants are under continued stress. Yield reductions are not likely. |
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| Links to state specific information: | |||||||||
| Georgia | Indiana | Missouri | Wisconsin | ||||||