Symptoms
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Flat, often shield-like or strongly inflated aphids, often covered by white wool; needle/leaf-symptoms: spots; damage by sucking on shoots, twigs, stems: bark necroses, dieback, rarely death of the whole tree
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Impact
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Common on numerous plant species; effects are mostly loss of leaves or needles, which may weaken the plants, predisposing them to secondary damaging agents; some species may cause the death of plants by themselves.
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Control
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Only in case of epidemics and dependent on the aggressiveness of the species chemical control by insecticides (see official register of Plant Protection)
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Hosts |
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Maple;
All tree species;
Apple;
Barberry;
Birch;
Pear;
Beech;
Boxelder;
Douglas fir;
European mountain ash;
Edible chestnut;
English ivy;
Yew;
Oak;
Wild service tree;
Alder;
Ash;
Ex-Robinia;
Serviceberry;
Spruce;
Lilac;
Forsythia ;
Framire;
Ginkgo;
Tree-of-heaven;
European Hornbeam;
Dogwood;
Honeysuckle;
Elder;
Myrtle, Creeping Myrtle;
Cherry;
Larch;
Thuja;
Privet;
Linden, Lime;
Magnolia;
Redwood;
Giant sequoia;
Mulberry;
Common whitebeam;
Common medlar;
Cotoneaster;
Olive tree;
Poplar;
Bladdernut;
Plane;
Rhododendron;
Leyland cypress;
Rose;
Horse chestnut;
Japanese Pagoda tree;
Holly;
Southern Catalpa;
Elm;
Juniper;
Juniper cultivars;
Walnut;
Willow;
Common grape wine;
Hawthorne;
Cedar;
Hackberry;
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Affected plant parts
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Leaf;
Needle;
Shoot/Twig/Branch;
Stem;
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