Effect of aqueous extracts of black alder (''Alnus glutinosa ''(LINNAEUS, 1753) GAERTNER, 1791) and elder (''Sambucus nigra ''LINNAEUS, 1753) on the occurrence of ''[[Brevicoryne brassicae]]'' LINNAEUS, 1758 (Hemiptera, Aphidoidea), its parasitoid ''[[Diaeretiella rapae (parasitoid)|Diaeretiella rapae]]'' (M'INTOSH, 1855) (Hymenoptera, Ichneumonoidea) and predatory Syrphidae on white cabbage
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