These bioengineered crop varieties allow selective removal of a relatively broad spectrum of weed species with glyphosate. Bermudagrass is more tolerant than the other grass species listed. Asparagus, tall fescue and wild carrot and some morningglories are relatively tolerant. Potential escape of glyphosate resistant genes into weed populations. At lower doses, hard water or tank mixing with other herbicides may antagonize glyphosate performance.
Ammonium sulfate helps reduce the antagonism.
Initial translocation is symplastic into the growing points but appears to slow down or cease. Symptom development is very slow and requires two to three weeks or more. Shoot meristems cease growth. Yellow, pink and purple symptoms appear. Unexpected injury to the crop is a more frequent problem than with most herbicide families.