Apple Tree Diseases

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Apple tree diseases aren’t always difficult to prevent. You just have to know what to look for. In this article, we’ll discuss some common problems and how to avoid them. There are four main categories of apple tree diseases: Cork spot, Powdery mildew, Anthracnose canker, and Collar rot.

Phytophthora rot

Symptoms of Phytophthora rot include dead or diseased tissue at the base of the tree (canker). The canker forms on the bark between the soil line and the crown roots of the tree and expands slowly. To determine if your tree is infected, you must remove the outer bark and identify the infected area. Trees with affected tissue usually have early fall color and leaf out late in the spring. In some cases, the canker may girdle the tree and kill it.

Phytophthora rot is caused by several species of soilborne fungi. They can be found on many types of trees, including apple and pear trees. These fungi thrive in damp and moist soils, and can be introduced into an orchard through contaminated planting stock or by moving soil from an infected site. Phytophthora rot is a disease caused by fungi, and it can be treated with appropriate treatment and preventative measures to prevent the disease from developing.

Powdery mildew

Powdery mildew is a common disease that attacks apples. The disease can affect the entire plant, including the fruit and the leaves. Infected leaves will appear narrow and crinkled, and twigs will become stunted. Infected twigs can even die. Typically, a powdery mildew attack starts in spring. Symptoms of the disease include leaf discoloration, stunted growth, and yellowing of fruit.

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You can use commercial fungicides to treat and prevent this disease. These sprays contain ingredients such as sulfur, thiophanate methyl, chlorothalonil, and potassium bicarbonate. Be sure to use sterile pruning shears and dispose of infected shoots in an area far from the orchard.

Anthracnose canker

Anthracnose canker is a fungal disease that affects apple trees. This fungus causes cankers by exuding conidia from dead tree bark. These spores are spread by rain and wind. The infection can persist for more than a year in the canker tissue.

Canker infections appear as circular or ellipsoidal lesions in the bark of apple trees. As the disease progresses, cracks develop in the bark, separating infected tissue from healthy tissue. The infected area eventually shrinks and also develops long fibers. Which give the lesions a “fiddle string” appearance. Older cankers may remain on the tree for years, clinging to the skin.

Collar rot

Collar rot is a disease that affects apple trees. It can be control with proper irrigation management, using resistant rootstocks, and avoiding planting susceptible varieties in heavy or poorly-drained soil. Apple varieties that are resistant to collar rot include Golden Delicious, Jonathan, McIntosh, Rome Beauty, Wealthy, and Winesap. Infected trees should be removed, but if they are caught in an early stage. They can be treated by leaving the trunk exposed to the air and adding fresh soil in late fall.

Collar rot is caused by the fungus Phytophthora. This disease can cause damage to all parts of an apple tree, including the crown and roots. It is most common in low-lying areas of an orchard and in poorly-drained soil. The disease can kill a tree by girdling its trunk and damaging the roots below the soil’s surface. It can also kill the tree’s leaves. Because the symptoms of collar rot are similar to other root diseases. It is important to distinguish the two.

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Sooty blotch

Sooty blotch is a common fruit tree disease that results in discoloured fruit and unsightly blotches. It’s cause by the fungi Gloeodes and Leptodontidium, and is usually present in areas of humid climates. The fungi are spread by overwintering hosts. It can infect fruit any time after the petal fall. But it is most prevalent in mid to late summer. Several disease models are available to help predict when fruit will be affect. One of these models uses the number of leaf wetness hours as a proxy for fruit infection.

Apples that have this disease typically show smudges of dark charcoal on the surface of their fruit. They may also have black pinhead-sized spots that cluster together. The symptoms of sooty blotch can be cure by pruning the trees to promote a healthier environment.

Flyspeck

Flyspeck apple tree disease is cause by fungi that live on the stems of woody plants. It can develop up to two weeks after petal fall, and infections are intensified by prolonged periods of rain or poor drying conditions. The fungus thrives in warm, moist conditions, and conidia develop at temperatures ranging from eight to twenty-four degrees Celsius. Under optimal conditions, symptoms usually develop within eight to 12 days.

Pruning in summer is an effective method of controlling flyspeck. In a study, trees that were prune in summer were significantly less likely to develop the disease. Although a difference was not observe for leaf wetness or temperature readings. Summer pruning is an effective method of controlling flyspeck in orchards.

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