ARTICLES

Yellow Nutsedge (Cyperus esculentus) Interface in Peanut (Arachis hypogaea)

Authors: W. Carroll Johnson , Benjamin G. Mullinix

Abstract

Studies were conducted from 1997 to 1999 at the Coastal Plain Experiment Station in Tifton, GA to measure the full-season interference of yellow nutsedge in peanut using a response prediction experiment with a natural infestation of yellow nutsedge. Seeds of cultivar Georgia Green were planted in May each year, and plots were established immediately after crop emergence. Plots were 1.8 m by 1.8 m. with six replications. Yellow nutsedge plants were counted 28 d after crop emergence in each plot, and six weed-free plots were randomly established. Parameters measured were peanut yield and yellow nutsedge tuber contamination in harvested peanut. Yellow nutsedge densities ranged from 0 to 169 plantsm/². Regression analysis indicated a 25% reduction in peanut yield with a yellow nutsedge infestation of approximately 68 plants/m. Each yellow nutsedge plantm/² reduced peanut yield by 13 kgha. There was a positive linear response between yellow nutsedge density and number of tubers contaminating harvested peanut. Tuber contamination increased by 5190 tubersha for every yellow nutsedge plantm/². The results indicated that yellow nutsedge is a poor competitor with peanut. However, tuber contamination in harvested peanuts should be considered when using these results in developing treatment thresholds.

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Keywords: Economic threshold, integrated weed management, response prediction experiment, weed competition

How to Cite: Johnson, W. & Mullinix, B. (2003) “Yellow Nutsedge (Cyperus esculentus) Interface in Peanut (Arachis hypogaea)”, Peanut Science. 30(1). doi: https://doi.org/10.3146/pnut.30.1.0003