Common Diseases That Affects the Evergreen Tree

!±8± Common Diseases That Affects the Evergreen Tree

The evergreen tree is a beauty upon the year round landscape. The evergreen tree is a symbol of strength as the evergreen retains its color and needles even through the harsh winter months. People have fallen in love with the durability but yet simplistic grace of the evergreen tree. Unfortunately, there are several common diseases that affect the evergreen tree.

Evergreen trees can be killed or harmed by pathogens which are a disease-causing organism. The most common disease that affects the evergreen tree is caused by a type of fungi. Fungi lack the chlorophyll and therefore take nourishment from species in the evergreen family by feeding on these types of trees. Other tree diseases are caused from viruses and bacteria. An evergreen tree can become affected by a pathogen, viruses or bacteria in a number of different ways.

One disease that affects the evergreen tree is called needle cast tree disease. This is a disease that causes the evergreen tree to shed its needles. The symptoms of this type of disease will first appear on the needle. Needle cast tree disease appears as yellow spots on the needles which eventually turn red to brown. The growth of a certain species of fungi will form the spots on the evergreen's needles. When this disease is left untreated the needles fall off. Before the needles are shed tiny black fruiting bodies will form on the needle's surface.

Another type of disease that can affect the health of an evergreen tree is needle blight tree disease. There is a group of needle blight tree diseases that include Dothistroma, Diplodia and brown spot. These diseases are known to attack evergreen trees at the twig tips or the needles. The infected needle will fall from the tree due to the disease. When the needle falls from the tree this creates a denude look. If the evergreen tree is plagued by repeated cycles of infection then this can result in the loss of the tree. There are ways to prevent and to control needle blight tree disease.

A third common disease that affects the evergreen tree is canker tree disease. This is a type of disease where a canker either kills or causes blistering in the tree bark or the trunk of the diseased evergreen tree. There are dozens of known types of fungi that can cause this disease.

The last disease that can affect the evergreen tree is known as root disease. This is a wood decay disease. The fungi get in through the lower part of the tree or directly penetrate the root system of the tree. This fungus is able to travel from one tree to another on soilborne and airborne spores. If this disease is left untreated the evergreen tree will sadly rot from the roots upward.

Each of these diseases which affect an evergreen tree can be prevented or controlled. An evergreen tree is a beautiful natural resource that should be well cared for to ensure a long lifespan of the evergreen tree.

Common Diseases That Affects the Evergreen Tree

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The Ancient Ginkgo As Bonsai

!±8± The Ancient Ginkgo As Bonsai

Ginkgo Biloba Bonsai, the maidenhair tree, care and information

Ginkgo biloba are deciduous prehistoric trees once thought to be extinct until rediscovered in China. Teris Andre van Beek states, "Botanical and historical data suggest that the tree has survived because of the protection afforded by humans" (529). So there is some debate as to whether or not there are any truly wild trees left. However, most do agree there are some remaining in the wild in "east China, the West Tienmushan mountains, Zhejiang province, the southern mountainous area and the Dabieshan mountains" (Andre van Beek, 529). Fortunately for them their popularity in bonsai and landscaping should keep it from ever becoming close to extinction.

The maidenhair tree is very distinctive which makes it great for bonsai. Its fan shaped leaves consisting of two lobes turn bright golden yellow in fall. It has been referred to as the tree of forty gold crowns. They were given the name maidenhair tree because their leaves resemble that of the maidenhair fern. Even with typical bonsai leaf pruning and defoliation techniques the leaves of the ginkgo biloba will not reduce in size very much so for proper perspective one should use them in kifu, medium, and dai, large, bonsai instead of mame. Female trees tend to develop a wider crown whereas male trees tend to be slimmer. Male trees are normally used in landscaping because the fruit of the female trees have a foul odor. This is less of a problem in bonsai because they rarely fruit when grown as bonsai.

They do well as an outdoor bonsai because of their adaptability. It does well in full to partial sun. It is not as picky as some bonsai about what kind of soil you pot it in. A basic bonsai soil that is well draining and retains moisture works best. They are hardy in USDA zones 3 to 8A and can grow fine in the compact conditions of a bonsai pot. They are much more tolerant of drought than other bonsai trees and they are not prone to any pests.

It will do best in a deeper bonsai pot instead of a shallow one. If you live in an area where freezing temperatures are possible mica pots may be preferred as their roots are sensitive to freezing and mica pots do better at promoting stable soil temperatures. The roots need to be protected from freezing because they hold a large amount of moisture there. In areas where freezing weather is possible you can bury the bonsai pot at level with the ground and cover the surface with mulch. This will shield the soil in the bonsai pot from temperature extremes.

See Ginkgo Trees at http://www.MelloBonsai.com

The Ancient Ginkgo As Bonsai

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