What is the disease of the vine bait
It is a disease that mainly attacks the wood of the plant, of fungal origin, very common in Europe. The mushrooms involved in this particular species of pathology are the phaeomoniella chlamydospora and the phaeoacremonium aleophilum, which multiply through the production of spores capable of removing sap from the vine for use as nourishment. Already in the cuttings these two fungi begin their infection, propagating it with ease through the lymphatic vessels. Due to their infestation, the wood of the vine has dark veins which represent a significant alarm bell. On the other hand, in young plants, especially foreign and Italian ones, this pathology affects rootstocks, reducing their growth. Furthermore, the latter show a bad weld to the mother plant and a delayed, if not scarce, fruit production.
Symptoms and damages
The most evident symptoms of the attack of this pathology are manifested first of all on the leaves. The latter in fact have lighter green or even yellowish spots on the edges, while the internal veins remain green. Over time, the patches darken until the leaf dries up and causes its early fall. The branches are characterized by a delay in lignification, up to the desiccation as well as the buds that slow down their germination. Finally, on the berries there is a purple punctuation, both on the skin and on their attachment. The formation of dark dots on the peel is not caused by the fungus itself but by its production of toxic substances in the woody tissue. This particular disease affects table grapes more than anything else, as the wine grape is more resistant to pathogenic fungi.