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Bark beetles of Cupressaceae - Phloesinus thujae, Phloeosinus aubei | deutsch

Symptoms    Crown decline or death of the whole tree; on the bark numerous entrance and emerging holes of beetles, underneath bark galleries: mostly dubble arm-shaped, rather star-shaped longitudinal tunnel (up to 5cm in length); pupation deep inside the springwood; both species small (1,6-2,4mm), brown to black; generation-cycle one year; flight period of the adults mid May to June; the young beetles mostly enter in branch forks (shavings, resin flow) and mine the lateral shoots (ca. 0,5 – 1cm in length – maturation feeding); attacked twigs turn yellow and easily break off.
Impact    Attacks in general only of weakened plants, beetles can change into primary agents in case of intense propagation; during the maturation feeding only optical impairment, the following feeding (from a twig diameter of ca. 3cm on) causes the decline of plant parts or the whole plant.
Control    Maturation feeding: hygienic measures: removal of the infested branches, as long as the beetles are present in the shoot (until late autumn); feeding for breeding: removal of the plants, as long infestation is observed.
Hosts   Thuja; Giant sequoia; False Cypress; Juniper; Juniper cultivars;
Affected plant parts    Shoot/Twig/Branch; Stem;

Phloesinus thujae: symptoms
Phloesinus thujae: emerging holes
Phloesinus thujae: maturation feeding, symptoms
Phloesinus thujae: maturation feeding, detail
Phloesinus thujae: frass

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