![]() ![]() Therefore, it is important to ensure that your magnolias are not hurt while pruning or otherwise. They enter the plants through their wounds, abrasions or scratches. Such bacteria are carried from one place to another by wind, water and even polluted soils. The bacterium, for instance Pseudomonas syringae, which is responsible for leaf spots as well as leaf blight, is generally present in the rubble of the affected trees. Causes: While fungal leaf spots are quite widespread in magnolias, bacterial leaf spots are not so prevalent in magnolia trees. When the tiny leaf spots fuse to develop into large noxious and destructive areas, the condition is known as leaf blight - as in the case of fungal leaf spot disease. There are some other symptoms associated with the bacterial leaf spot disease and they include stem tip or flower dieback, veins becoming darker, and even stem cankers that emit a gum-like fluid. In many cases, the trees may also shed these affected leaves prematurely. As a result, the affected leaves become curly, distorted, develop holes and are even tattered and worn out in places. When the bacterial infection spreads, the brown spots merge to create large lacerations that cause the leaf to dry up from its center. In a number of instances, you may also notice a yellow halo encircling the brown leaf spots. Identification tips: When you notice brownish, angular spots that build up the length of the veins of your magnolia leaves. Potential causes: These conditions are generally attributed to the disease called bacterial leaf spot. Symptoms: Leaves developing brown spots, leaf dropping and dieback of the stem tips. When the air circulation is appropriate, it will help in preventing the magnolia trees from being infected. In case the foliage of your magnolia tree is dense, it is advisable that you prune the branches with a view to ensure proper air circulation. Before using the fungicides, it is important to read the instructions on the product label carefully and strictly abide by them. In addition, they may also help to avoid secondary infections in magnolia trees that are already infected by these fungi. Spraying fungicidal may help to prevent the occurrence of these diseases. Ensure that you cut back the weak as well as affected branches as soon as you notice them. At the same time, never water the magnolia foliage. Control and prevention: In order to avoid these diseases from affecting your magnolias, it is important to select plant varieties that are disease resistant. While mild fungal infections are unlikely to cause much harm to the affected magnolia trees, when the infestation is heavy and occurs often accompanied by untimely shedding of leaves, it may adversely affect the growth of the trees. At the same time, plants growing in a crowded location may facilitate the development of these fungal diseases. Therefore, magnolia trees that grow in damp, shady and humid places are more susceptible to being infected by these fungi and develop leaf spots. When the spores end up on a magnolia tree, they start germinating and growing whenever the prevailing conditions are favourable. These fungi generate spores throughout spring as well as summer and these spores are transported by wind, rainwater and even several insects. ![]() These fungi usually thrive in the wreckage of the infected trees. Causes: Fungal infections are said to be the most widespread reason behind these conditions. In the case of some magnolia trees, the stems, petioles, flowers as well as the fruits may also have fungal spots. Eventually, the color of the affected leaves may change from bluish-green to yellow or even brown and then drop from the branches. Alternatively, the center of the leaf spots may also have tiny holes. In a number of instances, the leaf spots may have a white center. Provided the infestation is heavy, the tiny leaf spots often merge and lead to large dead areas - a condition that is known as leaf blight. Some fungal infections result in the formation of leaf spots having dark margins, while there are others that develop in the form of concentric rings. This condition may be recognized by the leaf spots that can occur in different shades including yellow, grey, red, brown, black or purple. The symptoms of this disease on the trees may also vary somewhat depending on the type of fungi that invades the plant. Identification tips: While various types of fungi can infect magnolia trees, Phyllosticta, Septoria and Coniothyrium are the most common among others. Potential causes: Fungal leaf spot disease may be responsible for this condition. Symptoms: The leaves have grey/ purple spots and sometimes the entire leaf may be discoloured. ![]()
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