Grass Control in Corn
If your grass control quit working partway through the season, you’re not alone. Especially in corn this year, late emerging grasses were tough – and let’s face it, they have been more of a problem for the last few years. There are two strategies to fix this…
- Add more Group 15 to your PRE. Simply increasing the rate of any of the Group 15’s (Harness, Surpass, Zidua, Outlook, Dual, etc.) up to the full rate can solve many of your annual grass problems, especially with foxtail control.
- Add a Group 15 to your post-emerge application. Just like what you’re probably doing in your soybeans, adding a Group 15 to your early post-emerge application can extend your residual control. Personally, I like Option 1 better since the Group 15’s have no contact weed control and need more rain to start working. Option 1 is more predictable. However, Option 2 may extend your residual later in the season.
The Dreaded Pigweed (and Other Broadleaves)
Pigweed (waterhemp, Palmer, etc.) control is being helped with cover crops, planting earlier in the spring, getting a thicker crop canopy, narrowing rows, and a host of cultural practices. Frankly, we’re hearing a ton of success stories on pigweed control. At the same time, there are some tough-looking fields.
From a herbicide standpoint, the 3 PRE strategy in soybeans is really working even in a dry year like 2020 was for many. Using a yellow like trifluralin or Prowl, plus a PPO like Valor or Authority, and adding metribuzin really works. The lesson from 2020 was to do it earlier to catch some moisture to get it working.