July 25, 2012
Lygus, bertha armyworm and diamondback moth have a number of natural enemies that will keep populations in check. These beneficial insects may not control an immediate insect threat — growers will still have to spray if economic thresholds are reached — but beneficials can keep a lid on populations. The key to preserving beneficial insects is to follow thresholds and…
July 18, 2012
Include nymphs (shown above) when doing lygus sweep net counts. Bertha risk rising. Zebra caterpillers are usually confined to small areas within a field. (Photo source: Roy Ellis)…
July 18, 2012
An AAFC study has shown very clearly that with continuous canola, there is a statistically significant increase in crop damage by root maggots. No insecticides are available to control root maggot in canola, but providing a one year break seems to make a significant reduction in root maggot losses, the study found…
June 27, 2012
Probably too early to spray cabbage seedpod weevil, diamondback continue feeding, bertha moth numbers are high in some regions, cutworms near the end but still active, and always think about those valuable beneficials — like those helpful killers, the lady bugs…
June 20, 2012
Leaf rollers probably aren't worth controlling. Wireworms will live up to 4 years as a larvae and will feed on canola. Bertha monitoring begins. Flea beetles numbers are falling for the season…
June 6, 2012
Diamondback moth and flea beetle damage can look similar in some cases. So can wireworm and cutworm underground feeding. Look for the damage and the insects before making a final spray decision…
May 16, 2012
The Canola Council of Canada is looking for growers and agronomists willing to collect cutworms for research. Cutworms are an increasing threat to canola and other crops, and growers will benefit from knowing more about this native pest…
August 10, 2011
Before spraying, make sure the worms feeding on your canola are actually the species you think they are. Bertha armyworm, diamondback moth larvae and cabbageworms can be confused. Here's how to tell the difference:…
July 7, 2011
Cabbage seedpod weevil adults have arrived and are feeding on volunteer canola at the bloom stage in southern Alberta and southwest Saskatchewan. Weevils move to canola fields at the bud to early flower stages. Growers should start scouting…
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