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Mulbery Bacterial Blight


Mulbery Bacterial Blight

Usually appear in

Spring to Autumn.

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Caused By:-     The Bacteria Pseudomonas syringae pv.mori


Mulberry Bacterial Blight(Pseudomonas syringae pv. mori) causes black or brown irregular spots on leaves, often with a yellow halo around the spot appears. As the infection progresses the entire leaf may become yellow wilt, turn brown and die. If blossom or tip are affected it dies back or the buds may become distorted. Lesions on flowers, fruits and stems; and brown streaks in the wood are all symptoms of this blight, which is a common bacterial infection of Mulberry trees. If the disease continues the tree vigour will be affected. Bacterial blight is most prevalent in prolonged, rainy springs, with the wettest areas showing the most extensive symptoms and infections.


Spraying does not reliably control bacterial blight and the best defence is to remove affected branches. Prune out those affected branches during dry weather; wet, rainy weather may spread the disease. Space plantings and prune to provide good air circulation. Do not over-fertilise affected plants as it encourages soft quick growing shoots which are more susceptible to the disease and water only at soil level. Mulberry trees with bacterial blight damage that is confined to the leaves and small twigs will usually recover, providing affected branches are pruned off. If cankers appear on the mulberry's trunk, it will most likely not recover and you should remove the tree. Some varieties are more susceptible to this disease.

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