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Gray mold: General information
This disease is caused by a fungus, Botrytis cinerea, and affects roses, vines, peaches, citrus fruits, other fruit plants, and many floral and ornamental plants, of which it particularly attacks buds and buds, preferring the non-lignified fabrics, rich in water; it can also attack the leaves and, if the disease is not treated, spreads on the fruits causing their detachment or anyway a decrease of the commercial value and sometimes the impossibility to consume them.
It looks like a gray mold, which covers the affected parts, in the form of a greyish, thick and felted patina, which causes it to wither and dry. In particular, the floral buds do not open and come off the plant.
This disease is favored by high humidity, lack of aeration, and high temperatures; the fungus can withstand very low temperatures, even in the form of mycelium, during a latent life, spreading as the temperature rises; sometimes during the cold months it can remain quiescent in the woody parts of the arboreal plants.
To defend against this disease it is advisable to prevent its occurrence by cultivating plants in the best way, avoiding excess nitrogen in the soil; in the presence of the fungus the affected plants must be treated with copper-based antibotritic products; or with phenylpyrroles, anilinopyrimidines, hydroxyanilides, dcarboxinids, Folpet or Fluazinam.