QUIZ – Insect thresholds

Three questions on insects found this week, as well as thresholds and control timing. While flea beetles are still the hot ticket, we don’t have a question on flea beetles this time. See more about them here.

1. What is this?

Bertha armyworm moth trap

RTK beacon

Sclerotinia spore collector

Weather station

2. Diamondback moth larvae numbers are generally low to moderate across the Prairies, but some agronomists have seen the typical windowpane damage on leaves (red arrow.) What is the threshold for diamondback moth larvae at the "vegetative to early-flowering stage" canola? 

Cumulative adult trap counts of 500+

Sweep net counts of 25-40 per 10 sweeps

50 per cent leaf area loss

100-150 per square metre

3. Early canola is coming into flower in the southwestern Prairies, which means sweep netting for cabbage seedpod weevil. What is the economic spray threshold for that pest?

25-40 per sweep

25-40 per 10 sweeps

25-40 per cent leaf area loss

25-40 per cent of pods with exit holes

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