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Ekologija / Ecology

ISSN 0235-7224
ISSN 2029-0586 (online)

2008 m. Nr. 4

Seasonal abundance of Brevicoryne brassicae L. and Diaeretiella rapae (M’Intosh) under different cabbage growing systems
Laisvūnė DUCHOVSKIENĖ, Laimutis RAUDONIS

In 2003–2004, the occurrence of cabbage aphid (Brevicoryne brassicae L.) and its main parasite Diaeretiella rapae (M’Intosh) was studied on ecologically growing white cabbage versus non manure fertilized and fertilized plots. During the observations, naturally occurring aphids and mummies were counted. D. rapae reduced the populations of cabbage aphid by 23.9–26.2% during both experimental years. The abundance of aphids and parasites was highest (p = 0.05) on fertilized cabbage. The highest parasitation was observed in the periods when the number of aphids on the plants was the lowest, at the end of July (2003) and at the beginning of August (2004) at the end of their occurrence on the plants.

Keywords: Brevicoryne brassicae, cabbage, growing systems, Diaeretiella rapae, parasitation

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