Herbicide Resistant Weeds

Biorational approaches to managing Datura stramonium.

Zhang JianHua, M. Salas L., N. Jordan R., and S. Weller C. 1999. Biorational approaches to managing Datura stramonium. Weed Science. 47: 750-756.

Field experiments were conducted at Lafayette, Indiana, from 1995 to 1997 to test approaches to managing atrazine-resistant Datura stramonium. Eight weed management programmes in a Zea mays (maize) cv. Pioneer 3489 and Glycine max (soyabean) cv. Edison rotation were evaluated for their effects on the dynamics of atrazine-resistant and -susceptible D. stramonium populations. Overall D. stramonium density and relative abundance of resistant (R) biotypes were greatly reduced in no-till Secale cereale (rye) cover crop management programmes without triazine compared to conventional-tillage systems with the application of triazine herbicides. The negative effects of no-till on D. stramonium were greater under a G. max-Z. mays-G. max rotation than under a Z. mays-G. max-Z. mays rotation. A cropping system involving more G. max phases under no-till reduced both the resistant and susceptible D. stramonium populations. Results from this study support the use of soil management, crop rotation, and negative cross-resistant herbicides to manage atrazine-resistant biotypes.