Insects

Diamondback moth larvae have been found in canola fields across the Prairies this year. Of those fields with the larvae, counts in many (perhaps

Bertha armyworm adult moth counts were generally low across the Prairies in 2017. A few trap sites did enter the moderate risk level, but

In dry conditions, existing lygus threshold tables are still appropriate when making spray decisions. These tables indicate that if canola at the pod ripening

Butterflies have siphoning mouth parts, much like a straw. They are harmless to crops and may actually provide some pollination benefit. Butterfly larvae from

Diamondback moth larvae have been found in many fields this year. In most cases counts have been well below economic thresholds, but keep looking

Grasshoppers can thrive in hot weather. The nominal threshold for grasshoppers in canola is 7-12 per square meter, with the low end more appropriate

In very dry conditions: If canola is $12 per bushel and spray costs $8 per acre, the threshold at the early pod stage is

While some areas are reporting higher numbers of diamondback moth larvae (shown above), it takes 100-150 larvae per square metre in immature to flowering

This article provides a review of thresholds for major insect pests of canola, as well as background on how they were established and how

These can be hard to tell apart sometimes. Pinched or otherwise damaged-looking stems can occur with all three. The photo shows blackleg infection. Here’s

As a rough estimate, the 20% flower or “bloom” stage is when the main stem has around 15 “flowers”. Canola can reach 20% bloom

Red turnip beetles are eating large patches in a few fields in central Alberta. Red turnip beetles eat plants from the brassica family only,