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


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
​  Bowsman 33​​​​
  Minitonas 21
​  Miniota 2
​  Onanole 2
​  Oak Bluff ​101
​  Morris ​80
​  Rosenort  14
​  Lowe Farm 14
​  ​Seven Sisters 20
  Tourond 6
​  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).