Host species	click to enlarge
	Arborvitae (Thuja spp.), false cypress (Chamaecyparis spp.)
	Symptoms
	Already in autumn there is a continuous browning of the leaf scales beginning at the tips - scales translucent. Shoots are mined and contain larvae, in spring pupae. From June on nearly circular emergence holes mostly at the base of the brown shoot parts
	Causal agent
	Moth: light grey with brown and grey dots, about 6mm in size; egg deposition in June; young larvae enter leaf scales two weeks later. Larvae: reddish green to brownish green, head black
	Possibilities of errors
	Related species of the genus Argyresthia (Juniper mining moth*, Cypress mining moth); Kabatina - blight of Thuja*; other dieback fungi ; Didymascella - leaf blight of Cedar* *on this sample plate, the links are leading only to the german version without pictures
	Effects
	Brown shoots break and cause optical impairment. Repeated heavy attacks may cause death of very young plants
	Control
	Control with biotechnical insecticides (insect growth regulators) - no environmental impact, safe. Watch for the precise time of application (a few days after the flight period of the moths in June); control of the flight time possible with pheromone traps
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