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Mining moths of Cupressaceae– Juniper mining moth, Thuja mining moth, Cypress mining moth | deutsch

Symptoms    From autumn on browning of leaf scales beginning at the shoot tip; scales translucent when held towards the light; the shoots are mined, nearly free of feces, often containing a green to yellowish-green caterpillar, in later spring with a dark brown pupa. Varying among species, diagnosis is possible from June on by the small, round emerging holes on the shoots.
Impact    Moths do commonly not endanger plants, but may cause optical impairment. Following repeated infestation thinning of plants may be possible.
Control    Skinning inhibitors are most effective, stopping the development of the caterpillars already at early stages (see Official Register of Plant Protection). Right time for the application is the swarming time of the moths, which can be identified by pheromone traps or close observation. For hedges, intense pruning in autumn or in early spring reduces infestation.
Hosts   Thuja; Leyland cypress; False Cypress; Juniper;
Affected plant parts    Leaf; Shoot/Twig/Branch;


Juniper mining moth: caterpillar changing the feeding place
Juniper mining moth: mined shoot
Thuja mining moth: caterpillar in a mined shoot
Heavy infestation of a Thuja shoot-tip
Emerging hole with feces
Mined shoots with entrance and emerging holes, Juniper

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