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| It’s all about timing with Johnson grass. Early season effectiveness is going to be hit and miss. The later you spray and the taller the J grass the better the results. Not knowing your specifics, and the intensity of your J grass population. I would question if the J grass is really resistant to glyphosate. University weed scientist love to be the first to cry Wolf. The best control is going to be late season pre-harvest or post harvest even better. in the spring when J grass is breaking dormancy , the plant is sending its energy up from the rhizomes to establish new growth so it’s hard for the glyphosate to translocate down. In the fall, it’s just the opposite. The plant is sending energy to store in rhizomes which facilitates the movement of glyphosate to the roots. | |
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Glyphosate resistant Johnson Grass in Corn
