Diamondback Moth Monitoring Program in Manitoba - 2018

 

Diamondback moth does not overwinter well in the Canadian prairie provinces, but large numbers can potentially blow in. If conditions are favorable for their survival and reproduction when they arrive, and if natural enemies do not limit population establishment, populations can increase.

Pheromone-baited traps (Fig. 1), which attract the male moths, are established for a 6-8 week period from early-May until late-June to detect the arrival of populations of diamondback moth early in the season. The cumulative counts from the traps can not predict what levels of larvae will be, but can be used to determine regions of the province where increased attention for diamondback moth is recommended when scouting fields.

                                                                                      
Fig. 1. Trap for diamondback moth                                 Fig. 2. Diamondback moth on insert of trap

 Summary

Levels of moths have generally been low so far. The highest cumulative trap count as of June 12 was 101. Highest trap counts have been in the Central region and Interlake. Cumulative counts from the Southwest have been very low.


Table 1. Highest cumulative trap counts per region over the trapping period (April 29 to June 12, 2018):

 
Location Count
Northwest
  Bowsman 33
  Minitonas 21
Southwest
  Miniota 2
  Onanole 2
  
Central
  Oak Bluff 101
  Morris 80
  Rosenort  14
  Lowe Farm 14
Eastern
  Seven Sisters 20
  Tourond 6
 
Interlake
  Winnipeg Beach 68
  Warren 62
  Balmoral 31
  Teulon 15
 
 

Guidelines for monitoring larvae of diamondback moth can be found at: http://www.gov.mb.ca/agriculture/crops/insects/diamondback-moth.html

                                                        
                                            Fig. 3. Diamondback moth pupa (left) and larva (right).