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Thuja occidentalis, also known as northern white-cedar, [1] eastern white-cedar, [2] or arborvitae, [2] [3] is an evergreen coniferous tree, in the cypress family Cupressaceae, which is native to eastern Canada and much of the north-central and northeastern United States. [3] [4] It is widely cultivated as an ornamental plant.
Thuja are evergreen trees growing from 10 to 200 feet (3 to 61 metres) tall, with stringy-textured reddish-brown bark. The shoots are flat, with side shoots only in a single plane. The leaves are scale-like and 1 to 10 mm (0.039 to 0.394 in) long, except young seedlings in their first year, which have needle-like leaves.
Coleotechnites thujaella (brown arborvitae leafminer or brown cedar leafminer) is a moth of the family Gelechiidae. It is found in the north-eastern parts of the United States, as well as Canada. The wingspan is 9–10 mm. The forewings are cream white with three outwardly oblique, roughly triangular, black costal patches, all edged outwardly ...
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Needles turn yellow or brown or drop off completely most often due to improper watering (too much or too little), drafts, or low light. You can trim off the brown branches with pruners, but be ...
The symptoms give the disease its name. The first signs of infection that can be seen are yellow and brown spots that develop on the living needles, [7] [8] which soon turn red. This infection starts on the base of the crown on older needles, which then turn a brownish red at the tip, while the rest of the needle remains green. [9]
Symptoms include needles developing yellow spots, horizontal brown bands around the needles, swelling of needles, and off-white fruiting bodies formed on infected needles. [ 2 ] [ 3 ] Because Cyclaneusma is an ascomycete it produces two spore types, an asexual ( conidiomata ) and sexual ( ascomycota ) spore.
Platycladus is a monotypic genus of evergreen coniferous trees in the cypress family Cupressaceae, containing only one species, Platycladus orientalis, also known as Chinese thuja, [5] Oriental arborvitae, [6] Chinese arborvitae, biota or Oriental thuja.