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Gall mites on broadleaved trees | deutsch

Symptoms    Symptoms merely on leaves: galls, excrescences , deformation of leaves, filty galls or felty areas on the lower leaf surface varying considerably; sucking damage (punctual discoloratins); rarely on buds, shoots, blossoms and twigs (cankers)
Impact    Generally of low impact, sometimes loss of leaves; some species very common (for instance Aceria on leaves of Acer); many species inject substances into the leaves, which induces the production of abnormal structures by the leaves. In the abnormal tissues the gall mites hatch from the eggs deposited there; the felty areas are an effective protection for the young mites against predators (insects). The structures can be mistaken for galls by insects (gall wasps).
Control    Generally no measures necessary; to prevent from the optical impairment in economic plant production, acaricides can be used as a control (see Federal Register of Plant Protection).
Hosts   All tree species;
Affected plant parts    Leaf; Shoot/Twig/Branch;


leaf with form anomalies by gall mites
Leaf of Acer with tit-like galls
Leaf of Alnus glutinosa with felty galls
leaf of Cherry with galls
leaf of Cherry with galls
leaf of linden with galls

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