How to apply atrazine to st. augustine grass


How do I use atrazine in St Augustine?

Will atrazine kill St Augustine?

Yes, Southern Ag Atrazine Weed Killer for St. Augustine Grasses is able to be used on St. Augustine Floratam lawns. It is both a pre-emergent and post emergent and is best applied when weeds are small or have not yet emerged.

When should I apply atrazine?

You should apply Atrazine when the ground is dry. This product will control both emerged weeds and weeds from seeds. Rain or water within 2 or 3 days of application may decrease the effectiveness on emerged weeds.

How much atrazine do you mix per gallon?

4.3 fl ozs

Answer: According to the product label: You should mix 4.3 fl ozs of Hi Yield Atrazine per gallon of water for each 500 sq ft area.

How is atrazine applied?

Atrazine can be applied to the soil surface either before or after planting, incorporated into the soil prior to planting, or sprayed on corn and weeds, postemergence.

How do I apply atrazine?

Atrazine 4L’s label recommends applying the product at a rate of 1.5 fl. ozs. per 1,000 square feet in a gallon of water or 4 pints per acre in 15 gallons of water. For example, if you have a 3,000 square foot area to be treated, you would need 4.5 ozs of Atrazine mixed with 3 gallons of water.

How long does atrazine last?

How Long Does Atrazine Last? One application of Atrazine typically remains active in the soil for 6 weeks, killing weed seeds as well as the mature weeds in your lawn. Over the course of these 6 weeks, Atrazine is absorbed by plant roots and is gradually washed out of the soil by watering and precipitation.

How often can you use atrazine?

twice per year

Answer: Hi-Yield Atrazine Weed Killer can be applied twice per year per label instructions. 9 of 9 people found this answer helpful.

How long does it take for atrazine to kill weeds?

Typically, Atrazine is a very slow-acting herbicide, and it can take up to 4 to 6 weeks after application to see desired results and death of the target weed.

Can you spray atrazine before rain?

Moxy + Atrazine A 1-hour rain-free period is suggested for best control. Callisto Label states product is rainfast in one hour. Celebrity, Celebrity Plus For best performance, rain should not occur within four hours. Clarity A 4-hour rain-free period is suggested for best control.

How long does atrazine last on land?

If in the air, atrazine degrades quickly, with an estimated half-life of 14 hours. Atrazine has a low to moderate solubility in water. Atrazine does not bind well to soil and can easily move in it. It has an average half-life in soil of around 60-75 days.

Can atrazine be applied with a hose end sprayer?

Can Atrazine be applied with a hose-end sprayer? You can use Hi-Yield Atrazine Weed Killer in a hose end sprayer if you can calibrate to the amount needed for the area you are treating. Per the product label, you shoud use 4. 3 fl.

How do you mix atrazine herbicide?


  1. Mix the required quantity of Atrazine with clean water to form a smooth paste.
  2. Pour the paste into the spray tank through a sieve.
  3. Add water and keep the mixture in continuous suspension utilizing agitation.
  4. In general, use 100-200 litres of water per hectare.

What is the problem with atrazine?

Atrazine has a lot of adverse effect on health such as tumors, breast, ovarian, and uterine cancers as well as leukemia and lymphoma. It is an endocrine disrupting chemical interrupting regular hormone function and causing birth defects, reproductive tumors, and weight loss in amphibians as well as humans.

What are the dangers of atrazine if not used properly?

Numerous studies have provided overwhelming evidence linking atrazine to significant health concerns including increased risk of prostate cancer and decreased sperm count in men, and a higher risk of breast cancer in women.

Does rain affect atrazine?

Atrazine will control most small weeds that have emerged, while rain will activate the herbicide to control not-yet emerged weeds.

Is atrazine safe for dogs?

Any way you look at it, atrazine exposure is bad news for your family and your pets. Recent government studies have found there is significant evidence to suggest that exposure to this weed killer can cause a number of forms of cancer including ovarian, thyroid, non-Hodgkin’s lymphoma, and hairy cell leukemia.

Is atrazine a pesticide or herbicide?

Atrazine is an herbicide widely used for control of broadleaf and grassy weeds. It is sprayed on row crops such as corn, sorghum and sugarcane, and in some areas is used on residential lawns. It has also been used on highway and railroad rights-of-way.

What weeds does atrazine control?

Atrazine is effective against several common broadleaf weeds, such as Chickweed, Clover, Henbit, Pigweed, Ragweed, Doveweed, Oxalis, Betony, Gripeweed, and Morning Glory. Most pest grasses are also killed by Atrazine. This includes Foxtails, Annual Bluegrass, invasive Bermuda, Quackgrass, and Wire Grass.

Can you mix 24d and atrazine?

Answer: These products may be mixed together following the instructions on each product label. We do recommend a compatibility test if you have not done so previously. A compatibility test will check for changes in color, odor, and consistency.

Does atrazine kill crabgrass?

Atrazine is somewhat dangerous for crabgrass. While Atrazine will kill crabgrass seeds and new sprouts, it will not harm current crabgrass plants or stunt new growth no matter when it is applied.

Does atrazine carry over?

Products that have half-lives sufficient to result in occasional carryover include atrazine, chlorimuron, clopyralid, cloransulam, fomesafen, imazethapyr, isoxaflutole, and mesotrione.

Why we should use atrazine?

On farmed acres, atrazine helps reduce soil erosion by enabling no-till farming and conservation tillage. “Atrazine gives growers residual weed control, so they’re not having to do deep plowing every year, reducing soil and pesticide runoff,” says Dennis Kelly, head of state affairs at Syngenta.

Can Atrazine be used as post emergent?

For example, the post-emergence activity of atrazine can be increased by including an oil additive, yet additives should not be used if applying Balance Flexx or Corvus after corn emergence (Table 1). Tank-mix partners may cause other effects regardless of the application timing.

What is the blue stuff they spray on weeds?

It’s a chemical, Glyphosate, known more commonly as Rodeo, and it’s the same herbicide the city has been using for at least 10 years to control weeds in the park, says John Jenkins, assistant director of the parks department.

Does image hurt St Augustine grass?

Per the manufacturer, Image Herbicide for St. Augustine Grass and Centipede Grass Concentrate will kill Virginia Buttonweed.

What setting should I use on my hose end sprayer?

Start out with a 1 oz per gallon setting for products that recommend less than 5 oz per 1000 sf.

  1. Put the product in the bottle.
  2. Determine how much of the product you want to use for your lawn area. …
  3. Turn the water on at about ½ to ¾ pressure. …
  4. Walk at a moderate pace spraying a 6-8 wide swath.

Are hose end sprayers accurate?

Hose-end sprayers are sort of OK (if you remove the strainer) for spraying something that doesn’t need precise coverage, such as microbe products like beneficial nematodes, but they are not good for fertilizers and pest-control products where the concentration and coverage is important.

Can you mix Roundup and atrazine?

No problems. Like BB posted, bump your Roundup rate about 6 oz for the same effect. I post all my RR corn with either atrazine or a Bicep/Guardsman/generic tankmix with Roundup.

How much grass comes from a gallon of water?

Mix rates will vary depending on the targeted weed and the treatment area, but most applications will be 4 to 16 fluid ounces per acre. Spot treatments made be made at a rate of 0.33 to 0.65 oz. per gallon of water. Refer to the label to get the exact labelled rate for your weed and treatment area.

How are we exposed to atrazine?

You may be exposed by breathing, eating, or drinking the substance, or by skin contact. If you are exposed to atrazine, many factors determine whether you’ll be harmed. These factors include the dose (how much), the duration (how long), and how you come in contact with it/them.

Is atrazine hazardous waste?

HAZARDOUS WASTE. Contact your state Department of Environmental Protection (DEP) or your regional office of the federal Environmental Protection Agency (EPA) for specific recommendations. Prior to working with Atrazine you should be trained on its proper handling and storage.

Is atrazine approved by the EPA?

In October 2019, EPA released a memo entitled Regulatory Update on the Registration Review of AtrazineExit Exit EPA website, later cited in the September 2020 ID, that announced a policy decision that an atrazine concentration of 15 μg/L as a 60-day average triggers required monitoring and/or mitigation to protect …

How much rain do you need to activate atrazine?

Single Active Ingredient Products

Single Active Ingredient ProductsPrecipitation Required for Activation
Acetochlor (Harness/Degree)0.25 to 0.75 inches within 7 days after application
Pyroxasulfone (Zidua)0.5 inches before weed emergence
AtrazineNothing about precipitation amounts mentioned

How long does pre-emergent need to be down before it rains?

Principle #3: Pre-emergent herbicide must be watered in. Most products call for 0.5 inches of irrigation or rain within 21 days after application. If you’re working with a non-irrigated area or a drip zone, apply the pre-emergent just before rain is anticipated.

What does atrazine do to frogs?

Atrazine, one of the world’s most widely used pesticides, wreaks havoc with the sex lives of adult male frogs, emasculating three-quarters of them and turning one in 10 into females, according to a new study by University of California, Berkeley, biologists.

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