FAQ

How does atrazine work

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What is the mechanism of action for atrazine?

One proposed mechanism is that atrazine decreases the hypothalamic secretion of norepinephrine, which in turn decreases the release of GnRH (EPA 2002a, 2002c).

How does atrazine kill?

Atrazine kills plants by disrupting photosynthesis. Photosynthesis— unique to green, living plants—happens when light energy is converted to chemical energy needed for food production. Simply put, when food production stops, plants eventually starve to death.

What does atrazine do to weeds?

Atrazine is a common herbicide that acts as both a pre-emergent (kills weeds before they sprout) and post-emergent (kills mature weeds) weed control. Not only does Atrazine kill most weeds, but it also kills most grasses. This is great for controlling pest grasses but is harmful to many species of turfgrasses.

How does atrazine stop photosynthesis?

Atrazine inhibits photosynthesis by competitively associating with the plastoquinone B (QB) binding site of the D1 subunit of PSII, and therefore blocks chloroplast electron flow from plastoquinone A to QB, greatly reducing the production of ATP, nicotinamide adenine dinucleotide phosphate (NADPH), and CO2 fixation ( …

How long does atrazine last in water?

Without oxygen, atrazine has a half-life of around 578 days in water. Atrazine has a half-life of 168 days in water exposed to sunlight.

How long does it take for atrazine to work?

4 to 6 weeks

How long it takes to see results from an application of Atrazine can vary somewhat, depending on what type of weeds you are targeting. 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.

Does atrazine kill existing weeds?

Atrazine is a general-purpose herbicide that works as both a pre- and post-emergent. This means it will kill existing weeds and those that have yet to spring up from the ground.

Does atrazine kill weeds on contact?

If Atrazine has been used on your lawn or has been spilled on your lawn it is very difficult to get rid of and it will likely burn or kill any susceptible plants it comes into contact with. The best thing you can do is to dilute the area with water, at least 5 gallons per square foot, and allow it to rest.

How long does atrazine need to be sprayed 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 often can you apply atrazine?

twice per year

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

Is atrazine a pre or post emergent?

Atrazine has both preemergence and postemergence activity on a wide variety of annual broadleaf weeds. On centipedegrass or St. Augustinegrass, atrazine-fertilizer products can be applied after green-up and provide control of many annual broadleaf weeds.

Why is atrazine banned?

Research has linked atrazine to birth defects and cancer in people, and even miniscule doses can chemically castrate frogs. It has been banned or is being phased out in more than 35 countries but is the second-most commonly used herbicide in the United States.

How late can I spray atrazine?

Yes, the best time to apply Southern Ag Atrazine Weed Killer for St Augustine Grass is early morning or late evening when the temperatures are the coolest. As long as the application has had time to dry, high temperatures in the following days will not injure the lawn. 126 of 129 people found this answer helpful.

Can you spray atrazine in the rain?

Applying atrazine in the rain can cause excessive amounts of the herbicide to leach into groundwater. The dilution rates on the product label show the water that is necessary for successful application.

Does atrazine need a surfactant?

Answer: Hi-Yield Atrazine Weed Killer is already premixed with a surfactant and another surfactant does not need to be added to make the product more effective. 242 of 256 people found this answer helpful.

How do you remove atrazine from soil?

In one study, atrazine was removed from contaminated soil through a Fenton-like process using Steel Converter Slag (SCS) as the catalyst, demonstrating a high efficiency (93.7%). This efficiency was obtained under optimal conditions with a concentration of 10% O2 and an SCS load of 80 g kg−1.

What are the dangers of 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.

Should I water atrazine?

Rain or water within 2 or 3 days of application may decrease the effectiveness on emerged weeds. However, for the control of weeds from seeds, rainfall or watering is necessary within 7 to 10 days after treatment. 295 of 319 people found this answer helpful.

Does atrazine work in the winter?

Atrazine is good for winter weed control in lawns now through April. Atrazine controls weeds like annual bluegrass, white clover, chickweed, bedstraw and lawn burweed, also known as sticker weed.

Will atrazine kill trees?

The active ingredient in many, if not most, weed and feed products is Atrazine. It does the job well of killing weeds, but because it can kill weeds, it can kill other living plants as well, including trees. The tiny feeder roots of the trees pick up the chemical, which burns the roots, causing stress to the tree.

What is the half life of atrazine?

14 to 109 days

The half-life of atrazine in the atmosphere ranges from 14 to 109 days.

Does atrazine kill dandelions?

It also has lawn care uses, like for golf courses and residential lawns as a weed killer. It is great for dandelions and crab grass without killing your grass.

Is atrazine harmful to 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.

How long will Atrazine control weeds?

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.

Does Atrazine need rain to activate?

We are asked quite often how much rainfall it takes to activate a soil-applied, residual herbicide. … Single Active Ingredient Products.

Single Active Ingredient ProductsPrecipitation Required for Activation
Pyroxasulfone (Zidua)0.5 inches before weed emergence
AtrazineNothing about precipitation amounts mentioned

Can you mix Atrazine and 2,4-D?

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.

Can you apply atrazine in summer?

Atrazine is deadly on this weed and can be applied to St. Augustinegrass, centipedegrass and zoysiagrass when daytime highs are below 90. During hot weather, just spot treat where the weed is growing, and minimize contact with the lawn.

Does atrazine control crabgrass?

Atrazine will suppress crabgrass, but it may not competely control it. The best time to treat for post-emergent control is when the weeds are young and actively growing, usually when temperatures are between about 55 and 85 degrees.

Is atrazine still used?

Atrazine is one of the most commonly used herbicides in the US. Farmers spray it on crops such as corn, sorghum, and sugarcane to control grasses and broadleaf weeds. Consumers apply it to residential lawns to kill weeds. Atrazine persists in the environment and is a widespread drinking water contaminant.

What temperature should I spray atrazine?

Answer: Hi-Yield Atrazine Weed Killer can be applied early in the morning before temperatures reach 90 degrees if it’s expected to get this hot on the day of application. You just do not want to apply during the time of high temperature because your desirable turfgrass is under more stress in high heat.

Can atrazine be used on lawns?

Atrazine 4L is a post-emergent and pre-emergent herbicide designed to control various annual broadleaf and grass weeds growing on croplands, home lawns, ornamental turf, and rights-of-way. It can be applied by aerial or ground application methods.

Where is atrazine used the most?

Atrazine is a chlorinated triazine systemic herbicide that is used to selectively control annual grasses and broadleaf weeds before they emerge. Pesticide products containing atrazine are registered for use on several agricultural crops, with the highest use on field corn, sweet corn, sorghum, and sugarcane.

Where is atrazine commonly used?

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. EPA now restricts how atrazine can be used and applied.

What foods contain atrazine?

Atrazine is used on crops such as sugarcane, corn, pineapples, sorghum, and macadamia nuts, and on evergreen tree farms and for evergreen forest regrowth. It has also been used to keep weeds from growing on both highway and railroad rights-of way.

How tall of corn can you spray atrazine?

12 inches

It is extremely important to note that atrazine and atrazine-containing products can only be applied on corn up to 12 inches in height.

Is atrazine safe to use?

Atrazine has a stellar safety record. In 2006, the EPA completed a 12-year review that included 6,000 studies and 80,000 public comments. When agreeing to re-register the product, EPA concluded that it provided no harm to people. Moreover, the World Health Organization has found no health concerns with atrazine.

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