Weed management in sorghum cultivation M. Bagavathiannan, Texas A&M University, USA; W. Everman, North Carolina State University, USA; P. Govindasamy, Texas A&M University, USA; A. Dille and M. Jugulam, Kansas State University, USA; and J. Norsworthy, University of Arkansas, USA

1 Introduction

2 Critical period for weed control in sorghum

3 Chemical options for weed control in sorghum

4 Herbicide-resistant sorghum technology

5 Non-chemical options for weed control in sorghum

6 Weed shifts with production practices

7 Conclusion

8 Where to look for further information

9 References

Sorghum (Sorghum bicolor L.), an important food and feed crop worldwide, is considered a low-input, energy-efficient, and drought-tolerant crop, capable of growing well under marginal environmental conditions. The United States is the second largest producer and the leading exporter of grain sorghum in the world (USDA-FAS, 2016). In 2017, grain sorghum was planted on about 2.5 million ha throughout the United States (USDA-NASS, 2017). The total US export of grain sorghum in 2016 was valued >$2 billion (USDA-FAS, 2016), making it an important agricultural commodity in the United States. Kansas and Texas are the top two grain-sorghum-producing states with 1.1 and 0.7 million ha, respectively (USDA-NASS, 2017). Grain sorghum is a significant crop in other states such as Colorado, Oklahoma, South Dakota and Nebraska, and to some extent in the Midsouth in Arkansas, Missouri, Mississippi and Louisiana as well as in the Southeast in North Carolina (USDA-NASS, 2017).