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Thrips damage shows up in some fields. Bertha armyworms are the bigger issue, with adult counts continuing to build and many areas now at moderate risk, or higher. Read more to see links to latest maps and counts…
Canola Watch Posts
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The window to control disease in canola is closed, so why scout? Well, because the period from podding to harvest is the easiest time to see diseases. And if you can identify which diseases are present, you can adjust your variety choice, crop rotation and fungicide use for subsequent years… -
The pod stage is the critical time to watch for insect feeding in canola. When flowering is done, the crop cannot produce more flowers to compensate for insect losses. Thresholds for insects such as bertha armyworm, diamondback moth larvae (shown in the photo above) and lygus bugs are based on losses at pod feeding. However, take care with timing. Jumping… -
Bertha armyworm moth counts continue to accumulate across the Prairies. Many areas are now at moderate to high risk, and adult numbers will continue to build this week. Adult counts can hint at the potential level of feeding by the larvae — the actual armyworms — starting about two weeks after the first wave of adults showed up in traps… -
—Go out in early morning or late evening when larvae are mostly active. —Mark out an area a quarter-metre square (50 cm by 50 cm) and beat the plants growing within that area to dislodge the larvae. Count the larvae that have fallen to the ground and multiply by 4 to get the number per metre square. Larvae will hide… -
Canola destroyed by hail could be harvested as forage, replaced with a short-season barley silage crop, or turned under for green manure… -
Hail struck a number of areas over the past week, and canola damage ranged from light to total destruction. The photo above shows a couple hailstones collected around Lethbridge this week. Canola has a remarkable capacity to recover from light hail at early flowering — although if the flowering period is extended as a result, the crop may benefit from… -
10. Crops are in the 20-50% flowering window, yield potential is OK, there’s moisture in the canopy and you have sclerotinia spraying to do. 9. Cabbage seedpod weevils have moved into your area for the first time, and you have to do sweep netting to see if thresholds are at 2 per sweep. 8. Hail rolled through and you have…
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Canola is quite resilient to light hail at up to 20% flower. The crop can flower longer to compensate, and may recover with only minimal to moderate yield loss. Canola has also shown remarkable recovery from more intense hail at 20% flower. However, a crop flattened by hail is unlikely to recover. If regrowth occurs, which is possible, plants are…