2011 Archives

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I have grass that thus far is uncontrollable. It’s taken over almost half of my yard.  I took some to a nursery and they said it was a species of johnson grass.  Only grows about 1 foot tall and is very tough with a narrow leaf.  What can I use on this that will not kill my St Augustine?  Is there a preemerge and is it too late to use a preemerge?

Johnsongrass is one of the tougher weeds to control – especially when trying to treat a St. Augustine lawn. Over the years we’ve had people use two approaches. The first method is for when you have current infestations and involves the use of a post emerge.

Though the label does not list Johnsongrass specifically, we have had people apply both IMAGE and ATRAZINE to defeat it after finding it growing in their grass. This approach will usually require more than one application so plan on treating twice with the followup to be done 2 weeks after the initial. Also, target the Johsongrass. In other words, don’t spray the entire yard. And don’t soak it heavily either. Lightly spraying as much of the unwanted johnsongrass will do the trick if you treat throughout the season after it’s been growing.

The second approach is by far the most effective. Since johnsongrass comes back annually via seeds, a good application of a pre emerge like SURFLAN or RONSTAR G can keep it from ever growing. This is definitely the way to go. And there really isn’t a “wrong” time to use either. Both products can last 3-6 months so you need to be using it sometime in May-June then again in Sept-Oct and then again in Jan-Feb. I use it 3 times a year in my yard and have had great success keeping most any unwanted weed from growing. And the bottom line is it’s much easier to deal with these things with pre emerge products instead of a post emerge.

Here are direct links to the information and products listed above:

Image:  http://www.bugspraycart.com/yard/herbicide/image-24-oz

Atrazine:  http://www.bugspraycart.com/yard/herbicide/atrazine-quart

Surflan:  http://www.bugspraycart.com/yard/pre-emerge/surflan-pre-emergent

Ronstar:  http://www.bugspraycart.com/yard/pre-emerge/ronstar-g-herbicide-50-lbs

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can i apply liquid surflan to beds that have lillies or daffidills already 12 to 15 inches high?

Absolutely. As explained in our WEED CONTROL ARTICLE, one of the great features of SURFLAN is that it won’t hurt anything already growing. Use it at least twice a year to keep any weeds from growing locally in both your grass and flower beds.

Here are direct links to the information and products listed above:

Weed Control using Surflan:  http://www.lawn-weeds.com/weed-control#ground

Surflan:  http://www.bugspraycart.com/yard/pre-emerge/surflan-pre-emergent

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Do you have anything that can control Poa Annua in St. Augustine grass?
What about getting rid of Bermuda grass in St. Augustine?

ATRAZINE will handle the Poa Annua. You can read details on it’s label. However, Bermuda and St. Augustine are closely related and any product currently on the market that will kill Bermuda will most likely kill the St. Augustine as well. The most common Bermuda killer we sell is the TURFLON. It’s fine for fescue and bluegrass blends but will injure the St. Augustine if you broadcast it over the entire yard.

So your choices are to hand remove the Bermuda or try to isolate your treatments to just those patches. I have seen where people will use a weak mixture of Turflon and apply it to the center patches of Bermuda and carefully avoid getting any on the St. Augustine. This is not the most effective approach but it will save some time. And over the course of a few treatments, you can kill off 90+% of the Bermuda without hurting the St. Augustine so it’s somewhat effective.

Here are direct links to the information and products listed above:

Atrazine:  http://www.bugspraycart.com/yard/herbicide/atrazine-quart

Turflon:  http://www.bugspraycart.com/yard/herbicide/turflon-ester

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I have crab grass in my pasture of bermuda grass. I need to kill it now and prevent it from coming back. Can u help me with a product to use?

We can. In our WEED CONTROL ARTICLE, we have two products that will do the job. First, treat with the WEEDOUT which will kill exposed crab grass. Next, apply SURFLAN to stop anymore from growing.

Here are direct links to the information and products listed above:

Weed Control Article:  http://www.lawn-weeds.com/weed-control#grass

Weedout:  http://www.bugspraycart.com/yard/herbicide/weed-out-quinclorac-pint

Surflan:  http://www.bugspraycart.com/yard/pre-emerge/surflan-pre-emergent

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Once I have applied Weedar 64 to a grazing pasture, how long should I wait to reseed? One month? Two?

WEEDAR 64 is a broadleaf herbicide which means it targets broadleaf weeds. So the big question here is what kind of seeds are you looking to plant? If you review the Weedar Label, you’ll see there are some guidelines for certain plants but I’m not aware of any restrictions or waiting time listed if the seed is some kind of grass. Read through the label to make sure I’m not missing anything; here are the links:

Weedar 64 Label:  http://www.bugspray.net/labels/weedar_64_label.pdf

Weedar 64 Herbicide: http://www.bugspraycart.com/yard/herbicide/weedar-64-gallon

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