Aphid, Cabbage

Brevicoryne brassicae

Cabbage aphid
Cabbage aphid
Cabbage aphid
Cabbage aphids
Cabbage aphids [Credit: Lyle Buss]
Cabbage aphids [Credit: Lyle Buss]
Cabbage aphids on leaf
Cabbage aphids on leaf [Credit: Gary Chang]
Cabbage aphids on leaf [Credit: Gary Chang]
A cabbage aphid colony or cluster on a cabbage leaf
A cabbage aphid colony or cluster on a cabbage leaf [Credit: Lyle Buss]
A cabbage aphid colony or cluster on a cabbage leaf [Credit: Lyle Buss]
Cabbage aphids colony (or cluster) on a cabbage stem
Cabbage aphids colony (or cluster) on a cabbage stem [Credit: Lyle Buss]
Cabbage aphids colony (or cluster) on a cabbage stem [Credit: Lyle Buss]
Cabbage aphids
Cabbage aphids [Credit: Scot Nelson]
Cabbage aphids [Credit: Scot Nelson]


Host Plants:

On Crops: Brussels sprouts, cabbage, kale, rutabaga, turnip

Where Found:

Worldwide, wherever cabbage family crops are grown

Description:

Cabbage aphids are gray-green with a whitish waxy coating. They are often found in dense clusters on tender new growth. While present in spring and summer, populations increase by late summer and persist well into the autumn season.

Damage:

Cabbage aphids have good camouflage, and may not be seen until they have become quite numerous. In addition to the aphids themselves, look for black deposits of honeydew where the aphids have been feeding. Late-maturing Brussels sprouts and cabbage are at high risk for damage by cabbage aphids.

Preventing Problems:

Pull up and compost old plants, because cabbage aphids can overwinter in dead plant tissue. Clip off and compost stems holding aphid clusters. Harvest Brussels sprouts often, because sprouts left too long can serve as aphid nurseries. Encourage beneficial insects including lady beetles, syphid flies, and lacewings, which are important aphid predators.

Managing Outbreaks:

In small outbreaks, a high pressure spray from the garden hose can help remove cabbage aphids from plants. Follow up with two applications of insecticidal soap, one week apart. Be sure to apply the soap spray to leaf undersides and crevices.

Tips:

Lady beetles and their larvae are great beneficial insects to welcome into your garden. Ants tend to be attracted to the honeydew left by aphids, so ant activity can often lead you to aphid colonies.

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