Cabbage aphid (Brevicoryne brassicae) – pest management
The cabbage aphid, Brevicoryne brassicae, is a species widespread in all parts of the world.
Description. The aptery form has a spherical body, 2.1-2.6 mm long, yellow-green, covered with a waxy white-gray secretion. The winged form is smaller, 1.9-2 mm long. The head and thorax are dark browns. The yellow-green abdomen is decorated with a row of spots on the sides and a few darker central transverse stripes.
Biology and ecology. The cabbage aphids overwinter in the egg stage on the stems or petiole of cabbage leaves or other cultivated and spontaneous Cruciferous vegetables. Under normal conditions, from March to October, they produce up to 18 generations.
Damage. It is a migratory species and grows on various cruciferous plants, of which the most often attacked are cabbage, cauliflower, kohlrabi, radish, rapeseed, etc. On these plants, they develop crowded colonies, sometimes completely covering the leaves, shoots, and siliques. As a result of their stings, the leaves turn yellow, twist slightly, and dry out. When the attack takes place on seedlings, the plants stagnate and dry out.
Control. To control the cabbage aphid, specific insecticide treatments have to be carried out.
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