They are large at this stage of the season, often mature and starting to pupate, while bertha armyworm, if present at all as larvae, will be tiny. The key differences are that the clover cutworm strip is pink and the bertha stripe is yellow or orange, and that clover cutworms cycle earlier. They can both be green or brown, even black. They are about the same size when mature (1” to 1.5”). Clover cutworm is easy to confuse with bertha armyworm. Read the Canola Encyclopedia for more on scouting and thresholds.Ĭlover cutworm. See Saskatchewan’s bertha info and downloadable map. Find results for adult (moth) traps here: Alberta map and details on the risk levels. While cabbageworms tend to stay on the leaves as long as leaves are available, bertha will move up into the pods earlier.
Being part of the cutworm family, they also curl up when agitated. Mature larvae are up to 1.5” long, making them considerably larger than diamondback moth larvae at late stages. The green berthas are shinier than other green worms, and the yellow-orange stripe along each side is more pronounced, even on younger ones.
Berthas come in brown, black and green shades. Here’s how to distinguish the five most common green worms in canola. Before spraying, make sure your canola is at the right stage to be damaged by the worms and that the worms are actually the species you’re trying to control.
0 kommentar(er)
