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Symptoms
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Needles mined: mine mostly in the centre of the needle, with a small longitudinal slit or with a slightly elevated blister-like gall; yellowing of needles, finally loss of needles.
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Impact
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Epidemics mainly in dense stands of firs on humid and sheltered sites; needle loss a problem only in young fir stands(loss of increment and, especially in Christmas tree cultures, economic loss).
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Control
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Aeriation of the stand; only in case of mass development in very young cultures or in Christmas tree cultures systemic insecticides from August on (see federal register of plant protection).
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| Hosts |
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Fir;
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| Affected plant parts
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Needle;
Shoot/Twig/Branch;
Stem;
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