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Symptoms
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Black aphids in dense masses, individuals reaching several mm in size; on the bark of stems of mostly young conifers or broadleaved trees; older trees: rather on shoots and twigs. Impact: stunted shoot growth, shoot distortion, superficial damage to the bark
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Impact
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Growth anomalies only with young plants, here also rarely shoot dieback; in other cases only optical impairment.
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Control
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Hardly necessary; mass attacks of young conifer afforestations can be treated with biological compounds.
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| Hosts |
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Apple;
Edible chestnut;
Oak;
Spruce;
Pine;
Larch;
Thuja;
Poplar;
Rose;
Fir;
Juniper;
Juniper cultivars;
Willow;
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| Affected plant parts
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Shoot/Twig/Branch;
Stem;
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