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Insect Thresholds of Canola
| Pest | Threshold | Reference | |
| flea beetle | 25% of the cotyledons show severe pitting or tissue loss | UI CIS 982 (1993) | |
 |
cabbage seedpod weevils | after full bloom when 10-20% of blooms remain and 2 to 3 weevils per plant | UI CIS 982 (1993) |
 |
diamondback moth | 28 per square foot or 10 per plant, and the plants are under drought or other stress | UI CIS 982 (1993) |
 |
cutworms | 3 larvae per square yard | UI CIS 982 (1993) |
Thresholds are not available for these pests: aphids; cabbage flea beetle; lygus bugs; loopers; armyworms.
References: UI CIS 982 Insect pests of spring-planted canola.
Revised: August 12, 2008
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