Recently we received several phone calls about control of winter annual weeds in the fall and how temperature and frost might affect herbicide efficacy. Additionally, bright sunshine is needed for plants to recover.Strengthening Nebraska's Agricultural EconomyUNL web framework and quality assurance provided by the Herbicides applied in the fall will NOT provide control of summer annual weeds such as common waterhemp or palmer amaranth because they do not emerge until May.Six winter annual weeds have been identified as alternate hosts to soybean cyst nematode (SCN): purple deadnettle (strong host), henbit (strong host), field pennycress (moderate host), shepherd’s-purse (weak host), small-flowered bittercress (weak host), and common chickweed (weak host). 2,4-D is an herbicide that kills plants by changing the way certain cells grow. A recent survey reported that more than 2 million acres in Nebraska is infested with herbicide-resistant marestail. Most herbicide labels caution against treatment of plants growing under extreme environmental conditions or stress, because treatment of stressed plants can result in increased crop injury and/or decreased weed control. On all lawns, spray Weed-Be-Gon while weeds are actively growing and temperatures are below 90 degrees Fahrenheit. Identification of winter annual weeds is important to select the proper herbicide for effective management. Winter Annual Weeds and Soybean Cyst Nematode ManagementThe likelihood of reduced weed control due to cool temperatures will vary depending on the target weed, herbicide, and rate of application. The product’s label claims that it kills over 200 types of broadleaf weeds without harming the lawn. Have gotten a weed kill in 50 degree temps with 2-4d Ester.
If applied at lower temperatures, greenup may be delayed on these grasses. For more information, see this Purdue University Extension resource, Corn and soybean harvests were late this year due to rains in September and October and fall burndown applications were delayed in much of the state. The timing for the specific day is also important. Its active ingredients include mecoprop-p, a selective general-use post-emergence pesticide; 2,4-D, a systemic herbicide used to control broadleaf weeds, and dicamba, a benzoic acid herbicide that kills broadleaf weeds pre- and post-emergence. The form also affects what will happen to 2,4-D in the environment and what impacts it may have, especially on fish. Wear protective clothing when mixing and spraying Weed-B-Gon, such as long sleeved pants and shirt, goggles, chemical-proof gloves, shoes and socks. Instructions for Weed B Gon Concentrate Weed-B-Gon is manufactured by The Ortho Group in Marysville, Ohio.
After weeds experience frost active growth may not begin again for a few days. For larger infestations, use a tank sprayer. hardy in zones 3 or 4 through 7, depending on species; Kentucky bluegrass (Poa protensis), hardy in zones 3 through 7; zoysiagrass (Zoysia japonica) hardy in zones 5 through 10 and perennial ryegrass lawns (Lolium perenne), hardy in zones 7 through 10. SCN can reproduce in the field on henbit and purple deadnettle. If your lawn contains Burmuda grass, centipedegrass or St. Augustine grass, wait until air temperatures reliably remain above 45 degrees Fahrenheit. 2,4-D is used in many products to control weeds, and it is often mixed with other herbicides in t… Instructions for the Bayer Advanced Quart All-In-One Weed Killer Concentrate How Does a Turf & Lawn Tank Sprayer Work?
That's why field scouting is important before you decide about herbicide application. Frosts of less than 25°F usually cause leaf damage to annual plants, making them poor targets for herbicide applications; however, winter annual weeds may tolerate usually a frost up to 20°F and continue growing when conditions improve, with little tissue damage. (For more information see Fall herbicide application is not needed in each field. Dial sprayers attach to the hose. These are ideal for heavily infested lawns. With seasonally low air temperatures at this time, growers have asked about how temperature will affect the efficacy of fall burndown herbicide applications. In cool or cold climates in spring or fall, wait until the warmest part of the day to apply them. Use 4 tablespoons in 1 gallon of water when treating Bermuda grass (Cynodon dactylon), hardy in zones 7 through 10; bahia (Paspalum notatum Flugge) hardy in zones 7 through 11; fescue (Festuca spp.) 2,4-D comes in several chemical forms, including salts, esters, and an acid form. Generally, this would be when nighttime temperatures are 35°F or greater and daytime temperatures are at least 50°F for two consecutive days. Amine works better as the temperature warms up. Marestail can emerge in the fall and in the spring; however, Actively growing weeds are the key to achieving good control, whatever herbicide you use. This sprayer typically has a pump on top that is used to pump up the pressure inside the canister before spot spraying weeds. Spray volume should be 15 gallons per acre for better coverage when a dense weed population is present.Give to the University of Nebraska–LincolnApply to the University of Nebraska–Lincoln For just a few, isolated weeds, use a small pressure sprayer.
Herbicides generally are most effective when applied to vigorously growing plants at 70 to 85 degrees Fahrenheit.