Fungicides are effective against blight, but must be applied in the time and amount package instructions indicate. If the trunk of the evergreen becomes infected, pruning will do little to control the disease. The color on Emerald Green Arborvitae is an intense green, hence the name, and it is an evergreen conifer. It is easy to prune into size and can even tolerate very close planting. By the way, the cones won’t remain yellow green; they’ll turn brown at full maturity in early to late fall, then split open to release their seeds. The fact that the Emerald Green Arborvitae is also easy to prune and keep in shape, makes this low … Proper care and cultural methods will prevent and control canker disease. It is normally very disease resistant with the proper Green Giant Arborvitae care and preventative measures. Green emerald arborvitae (Thuja occidentalis “Smaragd”) is an evergreen tree or shrub growing in U.S. Department of Agriculture plant hardiness zones 4 to 8. A fungicide high in copper is the best to use. In fact, arborvitae is susceptible to a number of fungal diseases. An arborvitae is a narrow and dense evergreen tree that is extremely easy to grow. Prized for its emerald green color, award-winning Thuja occidentalis 'Smaragd' or 'Emerald Green' (American Arborvitae) is a semi-dwarf, evergreen shrub of compact, narrow, upright habit with erect sprays of glossy, bright green foliage. Disease Arborvitae suffer from a wide variety of fungal dis- eases, some of which are common on Long Island but not often seen in other parts of NY state. This product controls all life stages of unwanted insects. These trees can be grown at almost any time of the year and grow to heights of about 20 to 30 feet. Easy to grow and sized perfectly, these hedge trees are ideal for tight areas. Free Shipping over $125! This disease will result in brown, yellow and wilted foliage on infected branches. Arborvitae fungal diseases. The dead foliage will fall from the branch and defoliation will occur in inner area of the arborvitae. In extreme circumstances, canker disease will cause girdling and death to entire arborvitaes. Some people love arborvitae, and some hate them. Dark-colored spots develop and a reddish black sap will ooze out of the discolorations. The bark discolors and oozes resin or sap. A hybrid between T. standishi and T. plicata has been named as the cultivar Thuja 'Green Giant'.. Another very distinct and only distantly related species, formerly treated as Thuja orientalis, is now treated in a genus of its own, as Platycladus orientalis.The closest relatives of Thuja are Thujopsis dolabrata, distinct in its thicker foliage and stouter cones, and Tetraclinis articulata (Ancient Greek θυία or θύα, formerly … The cones will turn brown and open to release seeds. The tree is a member of the cypress trees family and is very popular for producing soft as well as richly green needles foliage, which eventually evolves into a dense canopy. Repeated incubations and isolations from affected tissue onto nutrient media, by multiple diagnosticians across the country, have consistently failed to produce any disease-causing microorganisms. Tiny spider mites are the common pests that will infect them. When canker diseases spread, they tend to kill off one distinct area … Keep the ground near and around the evergreen free from debris such as fallen plant matter. In very humid conditions, fungal diseases can be a problem - needle and twig blight are caused by fungi, especially if air circulation is poor; help prevent … This problem has been widely observed on arborvitae from all regions in Oregon, as well as from Washington, Idaho, and numerous other states across the country. Cercospora blight is a fungal disease showing signs of infection on the inner foliage at the base of the evergreen first and working its way outward and upward. This doesn’t mean the tree won’t have problems, however. Also called botrytis blight, gray mold leads to discolored and wilted foliage that decays … The arborvitae (Thuja) genus of shrubs and trees includes three different species comprising a large number of evergreens, ranging in size from 3 feet to 70 feet, with shapes ranging from low mounds to towering pyramids. The plant can survive with little to no water while also being resistant to most pests and diseases. Also known as Thuja occidentalis 'Smaragd', it is pest and disease resistant and drought tolerant once established. It is extremely popular as a hedge since it is healthy in both sun and partial sun and tolerant of a variety of watering and weather conditions. 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