Barricade 4FL can be applied to newly transplanted plants or established plants as directed on the label.
Apply before or after bulbs emerge but before bulbs bloom and weeds emergeYou will need to use 0.5 – 1.1 oz of Barricade 4FL per 1,000 sq. ft. for ornamental type areas, the amount of water you will need depends on the amount of water it takes to irrigate that area. If you're unsure, you will need to calibrate your sprayer. Please read the product label for complete application instructions.
You can typically apply a pre emergent such as Barricade 4FL Pre-Emergent Herbicide (Prodiamine) the same day or the following day as a fertilizer application as long as they do not have competing use instructions regarding watering in after treatment and they do not contain the same active ingredient as a pre-emergent.
As with any pre-emergent you do have to water in after application to get down into the soil to create the barrier. Per the product label: Weed control is most effective when Barricade 4FL is activated by at least 0.5 inch of rainfall or irrigation or shallow incorporation (1-2 inches) before weed seeds germinate and within 14 days following application.
You would just squeeze the bottle to get the needed amount into the measuring chamber on Barricade 4FL Pre-Emergent Herbicide Following the instructions for the "squeeze and pour" bottle in this video should help. It says for "insecticides", but it will work for this too.
We always recommend using products exactly as directed on the product label for several reasons. First, a product label has been reviewed and approved by the EPA and, therefore, provides the legally allowed uses for a product such as an insecticide or herbicide: The Label is the Law. Second, lots of time and money goes into developing and testing products, which means the label rates are what have been proven scientifically to be effective for treating the pests/weeds/diseases on that label. Using more is not necessarily going to be better. In fact, using too much Barricade 4FL Pre-Emergent Herbicide can cause undesired effects on your turfgrass and on the environment, and simply wasting your time and money.
Ideally watering in is done right after application of Barricade 4FL Pre-Emergent Herbicide but can be within 7 days of application. Timing your treatment with the rainfall is the best way to go as long as not too much! It only needs to be watered in ½ inch.
Yes, once you apply Barricade 4FL Pre-Emergent Herbicide (Prodiamine) in February, you can apply fertilizer at or around the same time. The only time we don't recommend applying a fertilizer is if it already contains a pre-emergent. If it is only a fertilizer, you can apply it at any time.
Barricade 4FL Pre-Emergent Herbicide (Prodiamine) does not list Ajuga reptans on its label. For a complete list see the label here. The Dimension product label states that ajuga carpet bugle is tolerant to applications as an alternative.
Barricade 4FL Pre-Emergent Herbicide (Prodiamine) is only a pre-emergent, used to prevent weeds from emerging. It will not kill anything that is actively growing. You will wait until the new lawn is established (mowed at least twice) before you apply Prodiamine. Blindside Herbicide WDG is a post-emergent that is safe to apply to established centipede grass to get rid of spurge.
Barricade 4FL Herbicide can be applied once or twice per year as long as you don't go over the 1.1 ounces per 1000 sq. ft per year(21 oz per acre/per year) for Turf Type Tall Fescue.
Doing a split application 60-90 days following the 1st application will give you longer residual control as opposed to a single application. We would recommend doing a second application at the 0.5 oz rate per 1000 sq ft to get the longer monthly residual.
Please review the charts of page 12 & 12 of the product label for more information.
Yes, Barricade 4FL Pre-Emergent Herbicide can be applied to creeping juniper and other listed varieties of juniper as directed.
Yes, Barricade 4FL Herbicide is safe to be used in perennial ryegrass and bermudagrass.
There should be no issue if applied at the product label rates. The shelf life of Barricade 4FL Pre-Emergent Herbicide (Prodiamine) is 3-5 years if kept in a cool dry area.
Barricade 4FL Pre-Emergent Herbicide (Prodiamine) is not labeled for prevention of dandelion. You could use Dimension 2EW or Gallery 75 DF as a pre-emergent for dandelion in the fall.
Barricade 4FL Pre-Emergent Herbicide (Prodiamine) is labeled to apply prior to germination of common purslane and other listed weeds found here on page 14.
Barricade 4FL Herbicide is not specifically labeled to be used around clover, so we cannot advise on this. For the best time to apply a pre emergent in your region to get the most effectiveness, we would recommend reaching out to your Master Gardener at your county extension office for a recommendation.
Barricade 4FL Pre-Emergent Herbicide (Prodiamine) is not labeled for pre emergent control chamberbitter. Barricade 4L can be used and sandy soil and last for the standard time frame of 3-4 months.
View our Chamberbitter Treatment Guide for more information.
Pre emergents are best applied in late fall when soil temps drop to 70 degrees and then again in early spring when soil temps rise to just under 55 degrees. Please view our Lawn Care Schedule Calendar for timing recommendations or contact your Cooperative Extension Office for exact timing recommendations in your area.
