How long must I wait before planting after applying Roundup? -Ron – According to Scotts, the manufacturer of Roundup (glyphosate), it is safe to plant ornamental flowers, shrubs, and trees the following day, and grasses, edible plants, and trees three days later.
Due to the rapid rate at which it breaks down, glyphosate is regarded as a relatively safe herbicide. However, when using glyphosate herbicides such as Roundup, I would always wait several days before digging. This is why: Contact weed killers, such as glyphosate, are absorbed through the leaves and make their way to the plant’s roots gradually.
If you plough, dig, or otherwise disturb the weeds before they are completely dead, you risk severing some live roots that will regrow. Residues in Edible Plants: A small amount of residue on the soil’s surface should not be harmful to new plants if it was applied correctly and with care.
How quickly can you sow after applying Roundup?
I’ve received a number of emails questioning the seeding delay following glyphosate applications. Glyphosate has no soil activity and will therefore have no effect on seedlings when applied on the same day. For maximum control of difficult-to-control weeds with stolons or rhizomes, however, a 7-day delay before raking or aerification is recommended in order to translocate herbicide to distant plant parts.
How soon can I spray Roundup in the spring, and how long must I wait after spraying Roundup before I can till the soil? The most important thing to remember and take into account when applying Roundup is that it is a “contact killer,” meaning that, in theory, it will kill ALL plants that it is sprayed on.
Therefore, it is essential to wait until ALL weeds have emerged in the spring BEFORE applying roundup or other “contact killers.” If you are impatient and spray Roundup immediately in the spring before many weeds have emerged, you will NOT kill the weeds that have not yet emerged and are growing, and you will have to deal with them later.
When using Roundup on new plots, we combine ANTLER KING’S PLOT MAX with Roundup in the same tank and apply both together in a single pass to eliminate existing weeds. Remember that ANTLER KING’S JOLT FOLIAR FERTILIZER can be tank-mixed with Roundup, so if you are spraying Roundup-ready corn or soybeans, you can kill the weeds and fertilize the desirable corn or soybean plants in a single pass! Wait 5 to 7 days after applying Roundup before tilling the soil: How soon can I spray Roundup in the spring, and how long must I wait after spraying Roundup before I can till the soil?
How soon after applying Roundup can corn be planted?
Corn Replanting and Herbicide Considerations – farmdoc As a result of the recent and excessive precipitation, there will likely be some corn replanting when soil conditions are favorable. We hope that only small areas of a given field require replanting, but in some instances, entire fields may need to be replanted.
There are numerous agronomic factors to consider when replanting, but weed control and herbicides should also be considered. The herbicide-resistance traits of the replanted hybrids must be considered. For instance, if you initially planted a glyphosate-resistant corn hybrid and have areas that need to be replanted, you should either replant these areas with a similar glyphosate-resistant hybrid or take special precautions to reduce drift with any postemergence glyphosate application if you replant with a non-glyphosate resistant hybrid because these plants will be extremely sensitive to glyphosate.
Is there a time frame between herbicide application and corn replanting? For corn herbicides applied to the soil, replanting can occur whenever field conditions allow. There are however intervals between application and replanting for certain postemergence corn herbicides.
- For instance, a 4-week, 14-day, 1-month, and 1-month interval must elapse between the herbicide application and corn replanting if a corn field previously treated with Spirit, NorthStar, Permit, or Yukon is lost due to excessive precipitation and must be replanted.
- While the majority of soil-applied herbicides permit multiple applications per season, a few can only be applied once per season.
The Acuron and Resicore labels, for instance, instruct against reapplication if corn is to be replanted. In situations where only small portions of a field will be replanted, some may choose to simply replant without applying any additional residual herbicide.
If you decide to apply a second application of a specific corn herbicide, keep in mind that many product labels specify a maximum rate per acre that can be applied during a single growing season. What options exist for eradicating any remaining corn plants from the initial planting prior to replanting? The replanting process can commence at any time after the tillage of existing corn plants, which is highly effective and reliable.
However, cultivation may not always be possible. Several herbicide options are available for controlling existing corn plants (Table 1), but care must be taken to determine whether or not the existing corn plants possess herbicide resistance trait(s).
| Corn trait | Tillage | SelectMax | Glyphosate | Glufosinate | Paraquat |
| Non-GMO | Yes | Yes | Yes | Yes | Yes |
| RR | Yes | Yes | No | Yes | Yes |
| LL | Yes | Yes | Yes | No | Yes |
| RR/LL | Yes | Yes | No | No | Yes |
Glyphosate is highly effective at controlling existing stands of glyphosate-sensitive corn. Corn can be replanted immediately after application, but control of existing plants may be enhanced if at least 24 hours pass between application and replanting.
- Glyphosate would also control sensitive weeds that may have emerged alongside the initial corn stand.
- Spray glyphosate with extreme caution to avoid drift, especially when spraying near wet holes.
- Other herbicides that can be used to control emerged corn include paraquat and glufosinate (only glufosinate-sensitive hybrids), although previous research has shown that complete control is not always achieved.
Typically, the performance of these plants is enhanced when atrazine or metribuzin is also applied. Additionally, paraquat and glufosinate would control a wide range of emerged weeds. Prior to replanting field corn, corn hybrids resistant to glyphosate, glufosinate, or both can be controlled with Select Max.
The label indicates that 6 fluid ounces per acre should be applied to control glyphosate-resistant field corn up to 12 inches in height. Applications should include NIS and AMS (do not use a COC or MSO for this specific use), and care must be taken to avoid in-field overlaps; otherwise, excessive damage to the replanted corn could occur.
Select Max can be tank-mixed with glyphosate to control broadleaf weeds that have emerged. DO NOT replant treated fields until six days after application, or severe damage to the replanted corn may occur. Poast, Poast Plus, Fusion, Fusilade, Select, and Assure II include an interval between application and rotation to or replanting with grass crops such as corn on their product labels.
- These intervals range from 30 (Poast, Poast Plus, Select) to 60 (Fusion, Fusliade) to as much as 120 (Assure II), rendering these products unsuitable for this specific application.
- If soil residues of any of the ACCase-inhibiting herbicides described here are taken up by the emerging corn plants, severe damage to replanted corn can occur (Figure 1).
Replanted corn damaged by ACCase-inhibiting herbicide residues in the soil: Corn Replanting and Herbicide Considerations – farmdoc
