PesthighApr–Sep

Cabbage fly

Delia radicum

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How to spot it

The cabbage fly lays its eggs at the root collar of crucifers, and the white maggots feed on the roots and root collars. Affected young plants wilt in the sun despite moist soil, turn bluish, and can be easily pulled from the ground. On kohlrabi and radishes, corky feeding sites with rot develop. The first generation in the cool spring is usually the most damaging.

Prevention

Place a cabbage collar made of felt or cardboard around the root collar immediately after planting. This prevents egg laying on the ground. A fine mesh protective net over the bed keeps the fly completely away and simultaneously protects against flea beetles and cabbage white butterflies. Mound the plants slightly so they form new roots above the feeding site, and maintain a multi-year crop rotation on crucifer beds.