Answer: Any pre-emergence product can be mixed with glyphosate and applied together. However, keep in mind that glyphosate will kill anything you spray it on. So when you spray it, you are killing all the grass you touch, not just the weeds.
Roundup is a herbicide marketed by Scott’s MiracleGro Company. The main ingredient is the chemical glyphosate. Roundup Extended Control Weed and Grass Herbicide contains a pre-emergence herbicide. Other Roundup formulations will only work on existing plants and won’t stop weeds from eating the seeds.
Mixing glyphosate with another herbicide that has a different mechanism of action can also be very helpful. Remember the importance of using clean water for the glyphosate spray solution. Glyphosate binds to soil particles, so that the herbicidal effect decreases when using muddy pond water.
Do not apply together. PostEmergent should be applied by foliar application, while Prodiamine should be applied to the floor. Two different actions require two different uses.
You can mix it with Roundup and use it as a herbicide and predictor. Surflan can be sprayed on many plants without damaging them, so it is applied before weeds grow, in late summer for winter plants and early spring for weeds and grasses.
Best Pre-Emergence Herbicides: Prodiamine (equivalent to a barricade) is the longest and cheapest due to slower application rates. Isoxaben (gallery equivalent) prevents a very long list of broadleaf weeds. Oxadiazon (equivalent to Ronstar) is a great alternative in granular form, safe for all herbs and ornamental plants.
Pre-emergence If you want to prevent crab grass and fertilize your lawn but have no plans to sow, consider Jonathan Green Organic Weed Preventer Plus lawn fertilizer. It prevents the growth of crab grass, dandelions and weeds and contains an organic fertilizer that quickly makes the lawn greener.
Pre-wash detergent is used to control weeds such as crab grass and foxtail. Additionally, it can also help with some common weeds, such as dandelions.
As with spring application, timing is very important to prevent winter weeds from infecting your lawn. The best time to use pre-emergence herbicides in the fall is from late summer to early fall, depending on the location.
Systemic Herbicides: RoundupPro and Finale RoundupPro (Glyphosate, Monsanto Corp.) is a post-emergence systemic herbicide that kills annual and perennial weeds. The benefits of RoundupPro include systemic destruction of annual and perennial weeds and low mammalian toxicity.
StaGreen Crab Grass Preventer states that the product can be effective for up to 4 months and recommends that you wait at least 12 weeks after use before reapplying.
Important: Pre-emergence is not intended to control existing weeds or weed seeds. Weeds are not killed until they start sprouting from the seed and reach the herbicide barrier. The seeds can remain dormant and will not be harmed by the use of pre-emergence herbicides.
It is good to use pre-emergence and fertilizer at the same time. Both should be poured with about 1/4 inch or less of water. It is not recommended to apply a contact herbicide at the same time as water, as the herbicide will be eliminated before the fertilizer emerges.
Pre-emergence herbicides kill weeds before they emerge from the ground, while post-emergence herbicides kill weeds that have already emerged.