INTEGRITY SAFER LAWNS AND HOMES - Weed and Feed Treatments - Trinity, FL
We will be applying  Corn Gluten every application throughout the year.
Corn Gluten Meal -- A Natural Lawn Care Herbicide
"Weed and feed" herbicide products get used on lawns in staggering amounts. For example, the U.S. Environmental Protection Agency (EPA) recently estimated that over 5 million pounds of the common herbicide 2,4-D are applied to lawns in these kinds of products every year. Because of the health and environmental hazards associated with use of these herbicides, a "natural" weed and feed product is an attractive idea to many people. A product called corn gluten meal fits this description.
What Is Corn Gluten Meal?
Corn gluten meal is a by-product of processing corn to make corn starch and corn syrup. It is generally sold as a golden yellow meal or as light brown granules. In addition to its use as an herbicide, it is used as food for cows, cats, dogs, fish, and poultry. Corn gluten meal is about 10 percent nitrogen so it's a good natural fertilizer.
How Does Corn Gluten Meal Work as an Herbicide?
Corn gluten meal prevents sprouting seeds from developing normal roots. This does not directly kill the seedlings, but makes them susceptible to dehydration if the soil gets dry. Established plants are not affected. The developing roots of a number of common weeds are affected by corn gluten meal: crabgrass, creeping bentgrass, smart weed, dandelions, redroot bigweed, purslane, lambsquarter, foxtail, barnyard grass, and Bermuda grass. Crabgrass is a common target of corn gluten meal products.
Is Corn Gluten Meal an Effective Herbicide?
Corn gluten meal was developed as an herbicide by Iowa State University horticulturist Nick Christians. Christians discovered corn gluten meal's herbicidal activity accidentally, while using corn gluten meal in a study of a fungus on a golf course.Christians followed up his discovery by studying how well corn gluten meal reduced the establishment of crabgrass in Kentucky bluegrass turf. He found that applications of 20 pounds of corn gluten meal per 1000 square feet of turf reduced crabgrass by about 60 percent. Christians also did a greenhouse study that looked at the effect of corn gluten meal on 22 different weeds. The most susceptible weeds were black nightshade, lambsquarters, creeping bentgrass, curly dock, purslane, and redroot pigweed. Corn gluten reduced root development and survival of all 22 species tested.
Status as a Pesticide
Corn gluten meal has been classified by EPA as a "minimum risk pesticide" that is exempt from registration requirements. This means that corn gluten meal products can be sold without going through EPA's registration process. EPA also has registered one corn gluten meal product as a biological pesticide.
Effective Use
Corn gluten meal is typically applied to lawns with a spreader. Most corn gluten meal suppliers suggest that between 12 and 20 pounds of corn gluten meal be applied per 1000 square feet of lawn. Typical recommendations also suggest two applications per year, the first one in the spring and a second one in the fall. To successfully kill weeds with corn gluten meal, timing is crucial. Remember that corn gluten meal needs to be applied when weed seeds are sprouting. Corn gluten meal suppliers recommend timing application In the fall, corn gluten meal suppliers suggest that you apply the product "following the hot, dry stress period of mid-summer," For corn gluten meal to be effective, "a drying period is required" after the product is applied. This kills the weeds that have roots damaged by corn gluten meal. Many suppliers also recommend watering in the corn gluten meal before drying out the soil. This means that following application you "irrigate the area and then allow for a short drying period. 
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