Further, this research documented the sympatry of feral sorghum and johnsongrass in the roadside habitat.
Sara Ohadi, Matthew Littlejohn, Mohsen Mesgaran, William Rooney, Muthukumar Bagavathiannan 2018, 'Surveying the spatial distribution of feral sorghum (Sorghum bicolor L.) and its sympatrywith johnsongrass (S. halepense) in South Texas.', PLoS ONEhttp://europepmc.org/articles/PMC5919511?pdf=render. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Johnsongrass competition with corn in untreated plots resulted in very low yield (174 kg/ha).
Ngouajio, M., Hagood Jr, ES. 1992, 'Rate and timing effect of CGA-136872 for postemergence Johnsongrass Sorghum halepenseL. control in corn Zea mays L', Tropiculturahttp://www.tropicultura.org/text/v10n2/43.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Consequently, male sterility in feral sorghum may increase the risk of outcrossing with johnsongrass.
Sara Ohadi, Matthew Littlejohn, Mohsen Mesgaran, William Rooney, Muthukumar Bagavathiannan 2018, 'Surveying the spatial distribution of feral sorghum (Sorghum bicolor L.) and its sympatrywith johnsongrass (S. halepense) in South Texas', PLOS ONE10.1371/journal.pone.0195511. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Increasing sequential application rate from 0.5 to 0.6 kg ha−1 reduced johnsongrass heights 15% at harvest.
Randall L. Landry, Daniel O. Stephenson, Brandi C. Woolam 2016, 'Glufosinate Rate and Timing for Control of Glyphosate-Resistant Rhizomatous Johnsongrass(Sorghum halepense) in Glufosinate-Resistant Soybean', International Journal of Agronomyhttp://dx.doi.org/10.1155/2016/8040235. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)