{ SEQ CHAPTER \H \R 1}SUGARBEET ROOT MAGGOT POPULATION FORECAST FOR 2007

The forecast map for anticipated risk from sugarbeet root maggot (SBRM) infestations is presented in Figure 1. Fly populations in several areas of the Red River Valley have the potential for being much higher than those observed in 2006. Data from sticky-stake trapping and root scarring surveys at several sentinel sites throughout the production area indicate that the highest infestations are expected to be in the Baker/Sabin, MN area. Maggot populations in the St. Thomas, ND vicinity will be high, but slightly lower than those in 2006. Risk is not yet sufficiently low in that area to reduce planting-time insecticide application rates. Those growers should remain vigilant in monitoring SBRM fly activity closely to determine the need for postemergence control interventions. Other areas of concern where moderate to possibly high populations could occur include townships near Borup and Crookston, MN, as well as Casselton, Amenia, and Forest River, ND. Low infestations are expected for most fields in the remainder of the Valley.