N
Fame Shock News

simazine herbicide

Author

Sophia Vance

Updated on June 10, 2026

What is the difference between atrazine and simazine? One main difference between simazine and atrazine is that the latter is a selective herbicide while the former is non-selective. This means that atrazine kills a particular type of plant while simazine kills plants more indiscriminately.

What is the chemical simazine used for?

Simazine is an herbicide of the triazine class. The compound is used to control broad-leaved weeds and annual grasses.

Is simazine banned?

Simazine is a banned chemical

It’s often not clear from the label on the front what’s in the container, but chemicals may be listed elsewhere on the packaging.

How long does simazine last in the soil?

Simazine is a flexible herbicide as it can be used to control weeds on agricultural sites, turfgrass, non-selective weed control on industrial sites and aquatic weed control. Simazine also has an impressive residual effect of 3 to 6 months.

How much is a gallon of simazine?

Princep Liquid treatments should be applied at a rate of 0.75 to 1.5 fl. oz. in a gallon of water per 1,000 sq. ft.

Can simazine be used as a post emergent?

Post-emergent annual bluegrass herbicides: When bermudagrass is mostly dormant, you can apply non-selective herbicides like glyphosate (Roundup, Glypro, etc.) or glufosinate (Finale). Simazine or flumioxazin will also offer post control of annual bluegrass.

How do you use simazine?

SIMAZINE 4L to weed-free soil during the spring and/or fall to control weeds expected to emerge during these periods. Apply prior to emergence of weeds or if weeds have emerged, apply in tank mixture with a contact herbicide. Use caution to keep the treatment off the foliage, fruit or trunk of citrus trees.

Is simazine a restricted use pesticide?

Drexel Simazine 4L is a state restricted use pesticide and is to be distributed only by licensed pesticide dealers. Only certified applicators or persons under the direct supervision of a certified applicator may apply Drexel Simazine 4L.

Does Simazine need to be watered in?

Generally, it is applied before emergence of weeds or following weed growth removal. Rainfall or irrigation is required to help penetrate it into the root zone.

How do you mix Simazine?

Mix one fluid ounce of Simazine with every 33.8 ounces (one liter) of water if the sprayer covers 40 squares. Mix 1.15 fluid ounces of Simazine with every 33.8 ounces (one liter) of water if the sprayer covers 50 squares.

Will Simazine hurt Bermuda grass?

Atrazine can be applied to actively growing and dormant centipedegrass or St. Augustinegrass but bermudagrass can be injured if treated while actively growing. Simazine (WynStar, others) may be applied to actively growing bermudagrass, centipedegrass, St. Augustinegrass and zoysiagrass lawns.

Do farmers still use atrazine?

Farmers use about 70 million pounds of atrazine in the U.S. every year. More than 90 percent is used on corn.

Is atrazine still used today?

September 21, 2020

Atrazine is commonly sprayed on young corn plants to control grasses and broadleaf weeds. After reviewing the risks of atrazine for more than 7 years, the US Environmental Protection Agency says the widely used herbicide can stay on the market with some new restrictions.

Is atrazine still on the market?

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.

What is the active ingredient in simazine?

ACTIVE INGREDIENT: Simazine (2-Chloro-4,6 bis(ethylamino)-s-triazine) OTHER INGREDIENTS: .. Contains 4 pounds active ingredient per gallon.

When should I mow my lawn after switching?

To control weeds during establishment, mow switchgrass to a height of 4 inches in May or 6 inches in June or July. Grazing is generally not recommended the first year, but a vigorous stand can be grazed late in the year if grazing periods are short with at least 30 days of rest provided between grazings.

Can you spray simazine on switchgrass?

Simazine can be applied after switchgrass has developed leaf area with no concern for foliar burn. If perennial, triazine-tolerant broadleaf weeds are present, a tank mix that includes simazine, 2,4-D and/or Banvel can be used after switchgrass and problem weeds emerge.