"Research was conducted at one location in 2003 and twolocations in 2004 and 2005 to evaluate the effects of stand loss, planting date, and replanting method on flue-curedtobacco yield and quality. Stand loss treatments included a 10%, 20%, 30%, and 40% stand loss at two and four weeksafter transplanting (WAT). In recent years, early season infections by Tomato spotted wilt virus (TSWV) have causedsignificant stand losses in North Carolina, so an additional treatment was included to simulate the effects of plant loss totomato spotted wilt. Simulated losses consisted of a 10%, 10%, and 20% stand loss at 3, 4, and 5 weeks aftertransplanting, respectively. Planting date treatments included planting at the normal transplanting date and at 2, 3, 4, and 5weeks after the normal transplanting date. To evaluate the effects of replanting method, tobacco was replanted at 2 or 4weeks after normal replanting on an existing row ridge, a rebedded row ridge, and a tilled and rebedded row ridge. Dueto excessive rainfall, stand loss and planting date had no effect on yield or quality in 2003. In 2004, the TSW stand losssimulation reduced yield at one location, but no differences were observed in other treatments. In 2005, yield and valuewere consistently reduced with stand losses of 20% or greater 4WAT at both locations, but results were lessconsistent when stand losses occurred 2 WAT. Delaying transplanting by 5 weeks at one location, by 4or 5 weeks attwo locations, and by 2 or more weeks at one location, reduced yield but did not affect quality. Replanting treatmentshad lower yields compared to the respective delayed transplanting date in 2003, but there were no affects onquality. Yield and quality were not consistently affected by replanting method in 2004 or 2005 when compared to therespective delay in transplanting. General conclusions and recommendations for growers to manage stand losses fromTSW or other causes are not clear. Inconsistent affects observed across years in our experiments were primarilyattributed to variability across growing seasons. However, the environmental variability observed in these experimentsis typical of tobacco producing areas of the United States. Because stand losses from TSW are gradual, it is likely thatby the time growers reach the levels of stand loss that significantly reduce tobacco yield, the yield loss associatedwith delayed planting would prohibit replanting from being a
viable management option."