1 This research was supported by both the Alabama and Florida Agric. Exp. Sta.
Field studies were conducted in Florida and Alabama during 2001 and 2002 to compare weed control systems for peanut (Arachis hypogaea L.) that included only the herbicides registered on peanut that do not inhibit aceto hydroxyl acid synthase (AHAS). Three non-AHAS systems were identified that consistently preformed equivalent to imazapic, i.e., an AHAS-inhibiting herbicide that is very effective in peanut. These systems were either S-metolachlor plus flumioxazin, S-metolachlor plus S-dimethenamid, or S-metolachor plus norflurazon applied preemergence (PRE), followed by paraquat plus bentazon plus 2,4-DB applied postemergence. Greenhouse studies established that tank mixtures of S-metolachlor plus flumioxazin and S-metolachor plus norflurazon applied PRE were synergistic with respect to yellow nutsedge (Cyperus esculentus L.) control. This synergism may contribute to the excellent performance of these S-metolachlor-containing tank mixtures in the field. Identification of systems which utilize herbicides with modes of action other than AHAS inhibition could offer rotational alternatives to delay the emergence of AHAS-resistant weed biotypes, or alternatives should such biotypes become problematic.
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Keywords: imazapic, Bristly starbur, sicklepod, Florida beggarweed, pitted morningglory, Yellow nutsedge, herbicide interactions.
How to Cite:
Wehtje, G. & Brecke, B., (2004) “Peanut Weed Control With and Without Acetolactate Synthase-inhibiting Herbicides¹”, Peanut Science 31(2), p.113-119. doi: https://doi.org/10.3146/pnut.31.2.0010