We do not recommend using dish soap to replace the required surfactant when using QuinKill Max Crabgrass and Weed Killer. Some can be ionic and may damage your lawn. We recommend using something like Duo Stick for best results.
QuinKill Max cannot be used on Bahia or St. Augustine grass. If you need to spot treat, you can also always use a non-selective herbicide such as RoundUp QuikPro and then replant in those areas.
Quinclorac is a great active to use and it must be used with a methylated seed oil surfactant such as Duo Stick for best results. With QuinKill max that you purchased, the timing is key though, under certain conditions, application of QuinKill made to annual grasses at 2 to 4 tiller may not provide complete control. A sequential application will be required for grass control in these situations. Optimum control is achieved when applications of QuinKill + methylated seed oil are applied either before second tiller or as weed grasses mature.
What rate was it applied it? Do you know what tiller stage the crabgrass was at? How many applications have been made at what timing between them? What type of surfactant was used? Q is a slow kill and can take up to 6 weeks to kill.
Q4 is an alternative that can kill faster and Dimension as a pre-emergent is good, it also has early post emergent crabgrass control.
QuinKill Max Crabgrass and Weed Killer is a post-emergent herbicide, so the best time to apply it is when the target weeds are actively growing. If you are targeting crabgrass, then it is best to treat in late spring/early summer when the crabgrass is still small, or later in the summer or early fall when the grass has resumed growing again. We have a great article here that can advise on the best time and treatments for elimination. For specific timing in your region, we would suggest contacting your local cooperative extension
You could see results of a QuinKill Max Crabgrass and Weed Killer application as early as 7 days but can take several weeks for a complete kill, approximately 4-6 depending on the weeds.
After speaking with the manfuacturer they have advised to use the Quinkill Max Crabgrass and Weed Killer to treat the crabgrass and to rotate your application with the Speedzone to prevent resistance of the herbicide. You can mix with Pendulum 3.3 EC to create a better residual effect. It is recommended to use a surfactant when applying the product to gain better control.
QuinKill Max Crabgrass and Weed Killer can be applied 21 days after initial application. Per the product label, you do not want want to apply more than 128 oz over 1 Acre per year. The mix ratios vary so the amount of applications allowed would vary.
QuinKill Max Crabgrass and Weed Killer is not labeled to kill poa annua, or annual bluegrass. In fact, bluegrass is highly tolerant to quinclorac. QuinKill Max can be used for some broadleaf species, including clovers, dollarweed, and speedwell. For better control of broadleaf weeds, you will probably want to tank mix with another product with 2,4-D or Trimec, such as Fertilome Weed-Out Lawn Weed Killer with Trimec. Be sure to check the product label to be sure it is safe to use on your turf. If you would like more assistance selecting a product for your needs, please feel free to call our Customer Service team at 866-581-7378 M-F 9a-5p EST.
Yes, QuinKill Max is safe to use on buffalograss.
QuinKill Max Crabgrass and Weed Killer can be used on Kentucky Bluegrass lawns to kill clovers and many other weeds. The verbiage on the product label stating “DO NOT apply to Bahiagrass, carpetgrass, St. Augustinegrass, centipedegrass, dichondra, or lawns or turf where desirable clovers are present” would be referring to lawns that use clovers for desirable ground cover.
QuinKill Max Crabgrass and Weed Killer may be used as a spot treatment or broadcast spray over turfgrass, including Fescue, Rye, Bermuda, Zoysia if used as directed. Do not apply to to Bahia-grass, Carpet-grass, St. Augustine-grass, Centipede-grass, Dichondra, or lawns where clovers are present.
QuinKill Max is labeled as safe to apply to fescue, rye, Bermuda, and zoysia grasses and should not harm them if used as directed. It should not be applied to bahia grass, carpetgrass, St. Augustine grass, centipede grass, or dichondra
QuinKill Max Crabgrass and Weed Killer is safe to use on Zoysiagrass and should not harm it if used as directed.
QuinKill Max Crabgrass and Weed Killer is a post-emergent herbicide, so the best time to apply it is when the target weeds are actively growing. QuinKill Max Crabgrass and Weed Killer should not be used in excessively hot or cold temperatures due to it burning the leaves of desirable plants. We would recommend using it in the early morning or late evening when the temperatures are not too hot or too cold. Typically this would be when temps are above 65 degrees and below 85 degress. For specific timing in your region, we would suggest contacting your local cooperative extension
QuinKill Max Crabgrass and Weed Killer is not labeled to kill nutsedge or dallisgrass. Please let us know what kind of turfgrass you have so that we can better assist you with product recommendations.
QuinKill Max Crabgrass and Weed Killer will burn down to the root of listed weeds.
