Friday, 16 August 2019

Bertha armyworm monitoring (August 15, 2019; Wk 19)

Bertha armyworm (Lepidoptera: Mamestra configurataImportant - Watch for updates from your provincial monitoring networks who are compiling cumulative pheromone-baited trap interceptions to assess risk levels in AlbertaSaskatchewan (updated 07Aug2019), and Manitoba (locate table on pg 6).  Regions in all three prairie provinces are reporting "uncertain" risk based on pheromone-baited unitrap cumulative counts.  

SCOUT NOW to confirm in-field larval counts and REMEMBER that LARVAL DENSITIES CAN VARY DRAMATICALLY even between adjacent fields!  Scout to protect @FieldHeroes and avoid economic losses! Use the Field Heroes' scouting guide for bertha armyworm and be sure to read more at their website!

Biological and monitoring information related to bertha armyworm in field crops is posted by the provinces of ManitobaSaskatchewanAlberta and the Prairie Pest Monitoring Network. Also refer to the bertha armyworm pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" which is a free downloadable document as both an English-enhanced or French-enhanced version.

Refer to the PPMN Bertha armyworm monitoring protocol for help when performing in-field scouting.  Use the images below (Fig. 1) to help identify egg masses and the economically important larvae in canola.

Figure 1. Stages of bertha armyworm from egg (A), larva (B), pupa (C) to adult (D).
Photos: J. Williams (Agriculture and Agri-Food Canada).

Now is the time to do in-field scouting for this insect pest.  Review the Insect of the Week which features bertha armyworm and its doppelganger, the clover cutworm!