Canola Insect Trapping Network Bertha Armyworm Week of - June 18 June 25 July 2 July 9 July 16 July 23 July 30 Cum. The population of adult bertha armyworms will be monitored during the flight and egg-laying period.
Monitoring is done using pheromone baited traps.
The monitoring period extends from about mid-June through July. Each week moths caught in the traps are counted, and data for that week, as well as cumulative moth counts, are entered into the table for the appropriate trapping area. The cumulative total number of moths will continue to rise until the end of the monitoring period. The following table relates the cumulative moth counts with the risk of larval infestation. 300 Low - Infestations are unlikely to be widespread, but fields should be inspected for signs of insects or damage.