In Arizona, you would generally make two applications of Dimension 2EW Herbicide 5 to 10 weeks apart. We would recommend the Program 2 or 3 rates of 1 oz per 1,000 sq ft and then 1.5 oz per 1,000 sq ft, or 2 applications of 1 oz per 1,000 sq ft each, according to the product label. Be sure that you immediately water-in the application with a high volume of water any time there is a barrier like gravel over the ground. This will help get more of the active ingredient down to the soil so that it is not just absorbed into the rocks before it can reach the dirt. (Since this product is still intended to be used around turfgrass and ornamentals, you may not get the same results on a stone area.) At the 1 oz,1000 sq ft rate, you would use 0.22 oz of Dimension 2EW in 1 gallon in your sprayer to cover 220 sq ft.
Dimension 2EW is one of our most popular pre-emergents for crabgrass as well as many other broadleaf weeds, and it can safely be used on St. Augustine grass. Please check the product label to ensure that it will control the other weeds that you are targeting.
For long term control though, you should apply a pre-emergent in the late fall and early spring which will prevent new crabgrass from coming up next year. If you apply pre-emergent every year, you should not have issues with crabgrass long term. Dimension 2EW is one of our most popular pre-emergents for crabgrass.
Dimension 2EW is labeled to control poa annua (annual bluegrass) before it emerges and should do a good job when applied at the right time. Please refer to the product label for complete instructions. If you are already dealing with Poa Annua, you will need to use a post-emergent, and we do carry several. Which you choose depends on your grass type. Certainty is a good choice, but please refer to the label to ensure it can be used on your lawn type.
Dimension 2 EW and Pendimethalin are labeled to prevent many of the same weeds, so we would recommend choosing the product that best fits your needs rather than making unnecessary applications. If you have specific questions about which pre-emergent would be best for your situation, you may reach our Customer Service team at 866-581-7378 M-F 9a-5p.
The program that is chosen will depend on how long Dimension 2EW Herbcide lasts in the soil. For example, if Program 1 is done, it will provide 3-5 months of pre-emergent control. Most pre-emergent products will have to be applied at least twice a year to prevent Spring and Summer weeds.
Both Dimension and Gallery are great pre-emergents and are OK for use around non-bearing vineyards only. We do not currently carry any pre-emergents that can be used around bearing vineyards.
We would not recommend applying herbicides such as Dimension 2EW Herbicide during active precipitation. Instead, you could use a higher volume of water, or you could irrigate the application yourself with at least 1/2 inch of water.
Dimension 2EW Herbicide is a pre-emergent herbicide to prevent weeds from germintating so it will not kill existing quackgrass. Unfortunately, there is really nothing that can be done other than spot treating with a Roundup-type product.
Centipede is listed as a tolerant grass on the product label. Be sure to read and follow the directions on the Dimension 2EW product label for best results.