With its great-tasting fruit---and being the sole source of food for the silk worm---the mulberry tree is grown around the world. The popular tree may be susceptible to some common fungi regardless of where it is planted. The fungi that attack mulberry trees are easy to identify and, fortunately, equally easy to treat.
Sooty canker fungus is a common disease of the mulberry tree. It first becomes evident on the upper area of the tree's main branches and the tree limbs themselves. Infected branches should be removed whenever signs of the disease appear, according to the Cooperative Extension Service at the University of Nevada. That treatment should only be used during a tree's dormant period. Proper mulching and irrigation also go a long way in preventing canker-causing diseases.
Mulberry tree leaves can be infected by either Cercospora moricola or Cercosporella mori. Each causes reddish-brown spots and can cause excessive damage during rainy weather, according to the Cooperative Extension Service at Oklahoma State University. Once leaves have become infected, the most common treatment is to allow the leaves to fall, gather them and then burn the infected leaves.
Fungicidal sprays offer an alternative to treating leaf fungi diseases. They are especially effective on heavy infestations during the spring, which can severely damage a tree and reduce the production of leaves and fruit. To be most effective, fungicides should be applied before and during an infection. Once used, fungicidal sprays must be reapplied to prevent future outbreaks.
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