pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-27-1-5 Articles Herbicide Systems for Golden Crownbeard (Verbesina encelioides) Control in Peanut1 W. J. Grichar * and D. C. Sestak 2 Res. Scientist and Tech., The Texas Agric. Exp. Sta., Yoakum, TX77843 *Corresponding author (email: taes@viptx.net).

1This research was supported by the Texas Peanut Producers Board. Use of trade or common names does not imply endorsement or criticism of the products by the Texas Agric. Exp. Sta. or judgment of similar products not mentioned.

 1 2000 1 2000 27 1 23 26 American Peanut Research and Education Society 2000 American Peanut Research and Education Society Abstract

Field studies were conducted in south Texas in 1994 and 1995 to evaluate various soil-applied herbicides alone and in combination with postemergence herbicides for golden crownbeard control. Ethalfluralin preplant incorporated (PPI) followed by imazapic or lactofen postemergence (POST) provided 100% golden crownbeard control. Ethalfluralin PPI followed by oxyfluorfen applied preemergence (PRE) or metolachlor + imazethapyr provided 90% control. Dimethenamid, ethalfluralin, and metolachlor alone failed to adequately control golden crownbeard. Golden crownbeard control was most effective when combination treatments were used (PPI or PRE followed by POST). Effective golden crownbeard control increased peanut yields up to 53% over that of the untreated check.

 Key Words Groundnut; , weed control; , yellowtop