By Blake Jackson
While the colder weather may seem to have slowed down weed growth, it's important to remember that many winter annual weeds are still actively growing and can quickly proliferate if left unchecked.
Key Weeds to Target
- Marestail: Fall is an ideal time to control marestail, particularly when the plants are young and actively growing. A tank mix of 2,4-D, glyphosate, and metribuzin can be effective.
- Dandelion: Fall applications of 2,4-D can help control dandelion.
- Chickweed: This weed can be particularly problematic in small grain fields. Herbicides like Harmony Extra and Quelex can be effective, but resistance is becoming an issue in some areas.
- Roughstalk Bluegrass: Fall and early spring applications of herbicides like Osprey, Axial, and PowerFlex can help control this weed in wheat fields.
Herbicide Considerations
- Temperature: Herbicides are most effective when applied during warmer temperatures. Aim for daytime temperatures above 50°F and nighttime temperatures above 40°F.
- Adjuvants: Using adjuvants like ammonium sulfate and crop oil concentrate can enhance herbicide uptake and efficacy.
- Residual Herbicides: Consider incorporating a residual herbicide like chlorimuron or simazine to prevent future weed emergence.
- Cover Crops: If you're growing a pure stand of cereal rye, wheat, or triticale, you can apply herbicides like 2,4-D, dicamba, or Harmony Extra/Audit to control broadleaf weeds. However, avoid applying these herbicides to cover crops that include legumes or brassicas.
While fall applications can be effective, it's important to monitor weather conditions and weed growth. If the weather turns cold and plants become dormant, herbicide applications may be less effective.
By taking timely action and using appropriate herbicides, you can effectively manage weeds and set your fields up for a successful growing season.
Photo Credit: gettyimages-zoomtravels
Categories: Pennsylvania, General