Sore of lead

Sore of lead: generalities

This disease owes its name to the coloring of the leaves of the plants that are affected, which become a silvery-gray color with metallic reflections.
It mainly affects fruit plants, especially peach, but sometimes it can also appear on ornamental plants.
It can occur in the hottest months of the year, and usually the disease is due to both high temperatures and excessive exposure to sunlight, and to parasitic agents, in fact the metal stains develop near the bites of mites; in these two cases the mal of lead is not very harmful for crops, in the case of mites then you can use special pesticides to eliminate them.
In the case in which instead the mal of the lead manifests itself at the beginning of spring it is an attack by a fungus, the Chondrosptereum purpureum, which, if not eradicated, can bring the plants to a strong deterioration, and even to death .
This disease initially strikes the leaves and usually develops in three phases: first the leaves are covered with silvery spots, subsequently bubbles and deformations of the leaf tissue are produced, and finally the disease does not allow the plant to regularly develop the leaves, which do not reach the dimensions required, but remain very small, in a rosette.
From the folgias the disease spreads also to the remaining parts of the plant, producing brown bubbles and necrotic parts of the trunk and roots.
Chondrostereum purpureum preferably develops on plants in acid soil, and often attacks freshly pruned plants. Lead sickness has no effective treatment, the parts plants affected by this disease should be pruned and burned; heavily affected plants must be eradicated and burned.
For this reason it is advisable to spread a special putty on fresh prunings, useful to disinfect the wound and to promote healing, and to remember to strerilize the tools used for pruning, so as not to spread any infections; It is also a good idea to prune the plants when the climate is not too humid, but wait a few days in a dry climate. Moreover, the Chandrostereum purpureum can be found as carpophores, especially on the poplar trunks, in this case it is good to burn the mushrooms.