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Symptoms
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In spring, feeding damage to needles at first on short shoots, later luxurious feeding on all needles and production of loose webs; remainings of the needles dry out, the shoots thus looking brown. In alpine regions above 1200m a.s.l.. Very sharp delimitation of attacked and non attacked trees (damage line); a second biotype of the larch tortrix attacks spruces and pines, but feeding only from bursting buds and shoots in May, therefore the trees do not appear brown.
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Impact
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More or less regular attacks of alpine larch stands with intervals of 8-9 years, lasting for about 3 years; loss in increment, shortening of needles following heavy infestation, increased danger of secondary agents; lack of food can cause attacks on spruce, where it can be dangerous for young trees.
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Control
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Generally none; for protection of young stands biotechnical compounds (see Official Register of Plant Protection)
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| Hosts |
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Spruce;
Pine;
Larch;
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| Affected plant parts
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Needle;
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