During cooler weather (March, April, and early May), ester formulations can be used safely, and typically provide better weed control than amines. This also comes into play when deciding what formulation to use ester or amine. Once the chemical is absorbed into the plant (either amine or ester), it is converted to the active acid, which in turn injures or kills plants that are susceptible to the respective herbicide.Īs we all know, correct timing is crucial for acceptable weed control. Plants are more likely to quickly absorb esters, as amines are more water soluble. This is due to the fact that esters are more soluble when in contact with the plant's waxy cuticle. Ester formulations are typically more active on weeds in comparison to amines. The question is then posed "Do esters or amines provide better weed control?" The answer to this question is not cut-and-dry. Amine formulations are typically used in landscape settings and scenarios when drift is a primary concern. Even though there are some "low volatile" esters available, amine salts are generally less volatile than esters. Higher vapor pressures result in increased volatilization. Esters have higher vapor pressures than amines. This can (and does) occur with several other commonly used herbicides.Ģ, 4-D and other herbicides are commonly formulated as either an amine salt or ester. In most cases, drift is a result of 2, 4-D's volatility when it vaporizes and moves to a non-target area. While not intended, herbicidal drift occurs on a regular basis. Many broadleaf plants including tomatoes, grapes, flowers, and some trees are sensitive to 2, 4-D. However, 2, 4-D can injure non-target species (including grasses) if used incorrectly. 2, 4-D controls a large number of perennial weeds, but usually has little effect on grasses. 2, 4-D has been a staple of weed control since the 1940s, and continues to be a primary ingredient in a majority of multiple-ingredient herbicide products. Using the right formulation can also prevent damage to non-target plants within the landscape as well.įor the sake of conversation, 2, 4-D will be used as an example. Knowing the difference between the two and when to use them can increase your weed control dramatically. Have you ever taken a close look at the active ingredients listed on the herbicide label that you use? Most combination products contain 2, 4,-D, dicamba, triclopyr, or MCPA, and are formulated in two ways amines or esters. Though hundreds of options exist, are you using the proper formulation for your application? Soon after, post-emergent weed treatments will also commence. At this point, most turf professionals are in the process of making preventative weed treatments to their properties.
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