Scouting time
During flowering, cabbage aphids feed and reproduce on the stalk inside the cluster of flower buds which makes it difficult for ladybugs to find and eat them.
Sampling method
When scouting, it is often necessary to push the flower cluster open with your fingers to find these aphids. Damage to flower buds and flowers prevents pod set and can severely reduce yields.
Thresholds
If aphids are present on plants throughout the field and threaten flower and seed production, insecticide treatment is recommended. Cabbage aphid tend to colonize the terminal buds late in the season. Cabbage aphids can reproduce and spread quickly, so it is important to regularly scout your fields during flowering. Treat at the bud, early bloom, and full bloom stages when infested stems (racemes) exceed 15 percent.
Chemical control
|
Chemical Name |
Product(s) |
|
Seed Treatments |
|
|
clothianidin* |
Poncho and Prosper |
|
imidacloprid |
Dyna-Shield Imidacloprid |
|
thiamethoxam* |
Helix Lite and Helix Xtra |
|
Foliar Sprays |
|
|
bifenthrin |
Annex, Bifenthrin, Capture, Discipline, Empower, Fanfare, Sniper and Tundra |
|
deltamethrin |
Delta Gold |
|
lambda-cyhalothrin |
Lambda T, Silencer, Taiga Z and Warrior with Zeon Technology |
|
gamma-cyhalothrin |
Proaxis |
|
methyl parathion |
Chemnova Methyl |
*Aphids are not specifically listed on label under canola, however some suppression of aphids can be expected based on usage in other crops. This web page was prepared to help producers manage insect populations with the best available methods proven practical under Kansas conditions. Pesticide label directions and restrictions are subject to change, and some may have changed since this publication was written. Kansas State University entomologists assume no responsibility for product performance, personal injury, property damage, or other types of loss resulting from the handling or use of the pesticides listed. Remember, it is illegal to use a pesticide in a manner that is inconsistent with the label. The user bears responsibility for correct use. Always read and follow label directions carefully.
Non-chemical controls
None listed.
Content authors
Disclaimers
This content may not be suitable for states other than Kansas.
