![]() Facet L is the new liquid formulation of quinclorac (previously Paramount 75 DF) and has excellent activity on field bindweed.Ī new technology for grass management is Inzen sorghum, a non-GMO type of sorghum. Although atrazine and Facet L have grass activity and can control tiny grass seedlings, it’s generally not a good practice to depend on these herbicides for grass control. There are no herbicides currently labeled for postemergence grass control in conventional grain sorghum. Grasses that emerge before the soil-applied herbicides are activated will not be controlled. For other annual grassy weeds, it will be important to apply one of the chloracetamide herbicides. If a field has severe shattercane or longspine sandbur pressure, planting grain sorghum is not recommended. Grass control in sorghum can be a difficult task in some cases. Weed escapes prior to this activation will need to be controlled with postemergence applied herbicides. ![]() Once rain is received, the herbicides are activated and weed control measures are in place. Without activation, poor broadleaf and grass control can be expected. The chloracetamide/atrazine herbicides will do a very good job of controlling most annual grassy weeds.Ī weakness of all soil-applied programs is that rainfall is required for activation. The addition of 10 oz of Verdict, which is a mix of 2 oz of Sharpen and 8.3 oz of Outlook, can help control triazine-resistant pigweeds as well as the large-seeded broadleaf weeds. Using a product such as Lumax EZ or Lexar EZ preemergence, which contains mesotrione (Callisto), will help control the triazine-resistant pigweeds and kochia. Some of the broadleaf escapes producers can expect when using the chloracetamide/atrazine mixtures are devilsclaw, puncturevine, velvetleaf, morningglory, atrazine-resistant kochia. Using a soil-applied chloracetamide herbicide with atrazine (such as Bicep II Magnum, Bicep Lite II Magnum, Outlook, Degree Xtra, Fultime NXT, or generic equivalents of these products) will greatly enhance controlling pigweeds. With the development of herbicide-resistant weeds, however, this is becoming increasingly difficult.Ĭontrol of pigweeds in sorghum is an increasing concern across the state. Broadleaf weeds generally can be controlled with a combination of preemergence and postemergence applied herbicides. In sorghum, the best choice of herbicides will depend on the weed species present. Current 2,4-D labels do not address a waiting period ahead of planting sorghum however, for corn or soybeans a 7-day waiting period is required for 1 pint or less of 2,4-D ester when used in the burndown. There is a waiting period of 15 days between application and sorghum planting when using 8 fl oz of Clarity. ![]() The addition of a dicamba product or 2,4-D with glyphosate generally will control broadleaf and grass weeds effectively provided an earlier burndown treatment has been applied in March or April. Sorghum should always be planted into a weed-free seedbed. Valor will control glyphosate-resistant and triazine-resistant pigweeds as it has a different mode of action than glyphosate and atrazine.Īn effective burndown prior to planting is essential if any weeds have emerged. It is essential that 1 inch of precipitation fall during the window between Valor application and sorghum planting. The Valor label allows the use of 2 oz/acre applied 30 days or more prior to sorghum planting. Atrazine + chloracetamide herbicides can be used effectively, however. A pound of atrazine may provide the needed protection unless the pigweed population is atrazine resistant. This can help minimize pigweed (Palmer amaranth and waterhemp) emergence in late April and May, prior to planting sorghum. If you are anticipating problems with glyphosate-resistant pigweeds, it may be very important to include in the April burndown treatment a residual product.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |