Biorational approaches to managingDatura stramonium

Field experiments were conducted from 1995 to 1997 to test approaches to managing atrazine-resistantDatura stramonium. Eight weed management programs in aZea maysandGlycine maxrotation were evaluated for their effects on the dynamics of atrazine-resistant and -susceptibleD. stramoniumpopulations. OverallD. stramoniumdensity and relative abundance of resistant (R) biotypes were greatly reduced in no-tillSecale cerealeL. (rye) cover crop management programs without triazine compared to conventional-tillage systems with the application of triazine herbicides. The negative effects of no-till onD. stramoniumwere greater under aG. max–Z. mays—G. max(SCS) rotation than under aZ. mays–G. max—Z. mays(CSC) rotation. A cropping system involving moreG. maxphases under no-till reduced both the resistant and susceptibleD. stramoniumpopulations. Results from this study support the use of soil management, crop rotation, and negative cross-resistant herbicides to manage atrazine-resistant biotypes.