Analysis - view details of type of pest/disease/disorder
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Scale insects - numerous species | deutsch

Symptoms    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
Impact    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.
Control    Only in case of epidemics and dependent on the aggressiveness of the species chemical control by insecticides (see official register of Plant Protection)
Hosts   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;
Affected plant parts    Leaf; Needle; Shoot/Twig/Branch; Stem;


Scale insects on young maples: mass development within bark protecting columns
Scale insect on a spruce needle
Masses of scale insects on needles of fir
Scale insects (Parthenolecanium) on Thuja
Horse chestnut scale - Pulvinaria regalis


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