Saskatchewan Agriculture has observed little emergence of Bertha armyworm in June but higher temperatures resulted in rapid emergence in July.
The provincial ag deparment monitors the emergence of Bertha armyworm moths during the growing season using a pheromone trapping system. The accompanying map displays the cumulative male moth counts collected in traps set up in locations throughout Saskatchewan.
Hot spots can be observed northeast of Saskatoon, north and west of Regina and in a pocket in the northeast corner of agro-Saskatchewan.
The levels shown are based on the results of actual numbers of male moths collected and reported by cooperators at weekly intervals since the traps were set up in June. Due to the cool spring of 2008, there was l Most years the peak emergence of the moths is noted about mid-July. The map is updated weekly until early August.
As with other insect pests, the most accurate method of assessing numbers of the destructive larvae in a crop is through individual field monitoring.