Stemphylium vesicarium is a parasitic fungus that affects plants and causes brown spotting of the pear tree. It is an insidious mushroom that is capable of ruining entire crops. The fungus is capable of causing lesions on the epidermis of the pears since during its vegetative activity it processes toxic substances for the plant. In the areas which are then necrotized by toxins, a rotting process develops which extends to the plant. The mushroom is easily localized in humid areas, where loamy or clayey soils are present and in the absence of proper ventilation of the plants. The mushroom is able to resist from year to year both on the leaves and on the fruits fallen on the ground, resuming its vegetative and pathogenetic activity in spring. The mushroom develops with a temperature between 22 and 26 degrees.
Brown spotted pear
The main symptoms of this particular typology can be highlighted throughout the period from flowering to harvest. The disease manifests itself with necrotic spots on the leaves, on the fruits, on the twigs. On the green parts of the plant, you may start to notice point spots that, proceeding with the infection, are able to cause the necrotization of all the tissues. On the fruits, the lesions can be highlighted more in the parts most exposed to light. On the fruits initially brown spots are formed with a size of a few millimeters which then grow larger while maintaining a circular shape. If not adequately contrasted, the infection could spread to the pulp, starting a process that will lead to fruit rot.