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Occurrence and Control of Triazine-Resistant Common Waterhemp (Amaranthus rudis) in Field Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Daniel D. Anderson
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583-0915
Fred W. Roeth
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583-0915
Alex R. Martin
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583-0915

Abstract

Triazine-resistant (TR) common waterhemp was reported and confirmed in Fillmore County, NE in 1990. A survey of 81 fields was conducted to characterize the occurrence of common waterhemp and grower practices. Sampled fields fell into three categories: suspected by growers to contain resistant plants (26 fields), randomly selected (28 fields), and adjacent to fields containing TR common waterhemp (27 fields). Resistant plants were found in 64% of all fields. Resistance was confirmed in 92% of the fields suspected by growers to contain resistant plants. Adjacent fields were no more likely to contain resistant plants than randomly chosen fields. Crop rotation did not significantly affect occurrence of resistance. Resistance was associated with the grower, indicating movement of resistant seed between fields via equipment. Atrazine, bromoxynil plus atrazine, and bentazon plus atrazine provided less than 75% postemergence control of TR common waterhemp, while primisulfuron, dicamba plus atrazine, primisulfuron plus dicamba, dicamba, 2,4-D ester, and metribuzin plus bentazon gave over 85% control.

Type
Research
Copyright
Copyright © 1996 by the Weed Science Society of America 

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