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Fall Tree Diseases in Dallas

Posted On: Tuesday, September 22nd, 2015  In: Blog  |   Comments Off on Fall Tree Diseases in Dallas

Are your leaves turning brown?
Wet Spring weather provides the optimal conditions for many diseases to reproduce and spread rapidly. Some do not show symptoms until late summer or early fall. Below are disease we have been seeing a lot of…

 
Anthracnose
Anthracnose is a group of diseases caused by several fungi. Spores spread the disease through wind, rain, or by mechanical means. Repeated defoliation reduces growth, weakens the tree, and increases its susceptibility to attack by other pests and to winter injury. Fungi reproduce rapidly during wet spring weather, and damage may appear later. Twig, bud, and shoot blight are more severe if the temperatures remain relatively cool during March and April (below 70°). Warm periods of 2 to 3 days (80°) will prevent the development of the fungus. It will most likely be necessary to treat this condition several times a year.

Hypoxylon Canker
Hypoxylon Canker is a fatal fungal disease that causes cankers on oaks, elms, pecans, maples, and other hardwoods. It eventually invades the sapwood of the tree, causing premature death. The fungus only attacks trees that have become stressed by drought conditions, construction, root damage, nutrient deficiencies, and herbicide damage. Airborne spores then attack the tree, sometimes after living on the healthy tree for extended periods of time. There is not cure for hypoxylon canker – any treatment application will simply help to maintain the tree and extend its life for as long as possible. Ongoing care will be necessary for the life of the tree.

Fire Blight
Fire Blight is a bacterial infection caused by a pathogen called Erwinia Amylovora. It thrives in warm, humid climates, and can double every 20 minutes at temperatures of 70-80°. Fire blight affects plants in the rose family, including Bradford pears, crabapples, Indian hawthorns, roses, and photinias. The disease commonly occurs in wounds and natural openings, spreads rapidly, and leads to decline and death. Treatment is only viable if less than 30% of the canopy is infected. It will be necessary to treat this condition several times within a year.

Iron Chlorosis
Iron Chlorosis is a condition caused by iron deficiency in the soil. Iron is involved in the synthesis of chloroplast proteins and chlorophyll in tree leaves. Iron deficiency leads to yellowing leaves (a condition called chlorosis) and a slow decline of the tree. Iron is available from soils at a pH of 6 or less, but is bound in insoluble forms in certain types of soils. Since iron chlorosis is a problem with soil, rather than with the tree itself, this condition generally requires ongoing treatment for the life of the tree.

 

Bacterial Leaf Scorch
This disease can present symptoms that initially look rather benign, but quickly spread and can fast become alarming in appearance. Bacterial Leaf Scorch is the spread of a bacteria known as Xylella fastidiosa, and many common local species are willing hosts, including: Oaks, Elms, Maples, Sweetgums, & Sycamores. It is spread by insects, primarily leaf hoppers & spittle bugs. These insects pierce the leaves and suck water and nutrients from your tree’s foliage. Any insect that comes in contact with an infected tree will quickly spread this disease to trees in the surrounding area.

Bacterial Leaf Scorch CAN be fatal. It attacks the xylem and as such, damages your tree’s ability to transport water. Infected trees begin to show signs of stress by initially browning around the outer edges while the center of the leaf is still green or has a yellowish border. The leaves quickly continue to discolor and frequently begin to shed. It is critical to identify the problem as early as possible in order to decrease the spread, and diminish the potential damage.

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