Individual cankers (areas of dead bark) girdle scattered branches, causing them to die. A Diplodia tip blight infection will often progress and start producing cankers on an infected tree. The same fungus also causes a canker disease on Austrian and Scots pines as well as white pine and concolor fir. The ornamental value is significantly diminished. Once it spreads throughout the tree, though, it can cause the eventual death of all the infected branches. These spores are carried by rain throughout the tree.īecause it produces most of its spores on the mature cones, Diplodia tip blight often does not show up until trees are 15 to 20 years old and producing the large cones. The Diplodia fungus (more properly called Sphaeropsis) also produces spores in fruiting structures that develop on the second-year female cones. Small black reproductive structures of the fungus can be seen at the base of these stunted needles. These needles appear as short brown tufts at the ends of the branches. The Diplodia fungus infects the growing buds and shoots, causing the newest needles of a tree to be stunted and brown. Diplodia Tip Blightĭiplodia tip blight is a common fungal disease of Austrian pine, although Scots, mugo, and red pine may also be affected. Common DiseasesĬommon diseases include Dothistroma needle blight and Sphaeropsis (Diplodia) tip blight. Depending on the scale, horticultural oil may control overwintering stages. Pine tortoise scale is brown and found on twigs. Pine needle scale is a white, elongated scale found on the needles. Stressed trees are more susceptible to attack. This occurs in mid to late April or when needle growth is about half developed.īark beetles bore into trunks making small holes scattered up and down the trunk. Pesticides are only effective when caterpillars are moving from overwintering sites to new shoots. The insects can be found in the shoots during May. European Pine shoot moth causes young shoots to fall over. All types produce honeydew which may support sooty mold.
Some adelgids will appear as white cottony growths on the bark. Common PestsĬommon insect pests include spider mites and pine needle scale. Large, fast growing deciduous trees should be spaced far enough (20' - 24') between rows to prevent shading pines. Planting TipsĪustrian pines are spaced 8' - 12' within a row and 12' - 18' between rows. Winter buds have a distinct silver color. The attractive bark has dark furrows with gray or gray-brown mottled ridges. Austrian pine needles are stiff, usually straight, 2" - 4" long and are in groups of 2. Noted for its dark, rich green foliage, Austrian pine provides a pleasant contrast with other plants. Young trees are pyramidal in shape, but become oval with age and, on some sites, flat topped. It has thrived for over 200 years in some of the worst soil and climate conditions America has to offer.Ĭan grow up to 60' high with a 20' - 40' spread. Over 217 million were planted during the nation's great dust bowl shelterbelt project. Its forebears were likely worshipped by the Romans over 2000 years ago. It was introduced to the United States in 1759. The Austrian Pine is a native of Austria, northern Italy and Yugoslavia. Landscapers use the dark beauty of these trees for backdrops, but it is also an excellent specimen tree because of its leaf pattern. This stately tree can be seen in parks, along streets, in residential landscapes, and as farm windbreaks throughout much of the United States. The Austrian Pine (Pinus nigra) is an extremely tolerant pine of adverse soil conditions and air pollution.
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