Mycologia, ASCOMYCOTINA, DOTHIDEALES .
Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images
Elongated unilateral stains in early ripened shoots which, later on, become beige, near the base of the shoots and nearer internodes.
Irregular necrosis of the tissues, spreading to the branches.
Longitudinal fissures caused by the swelling of the tissues in the basal area, due to strangling of the shoot.
Later, by July, basal disarticulation as a result of the weight of the bunches and of the wind.
Necroses in the petioles and leaf veins.
Brown stains, roundish and depressed, on the berries,at maturation.
Wilt of the bunches, caused by reddish or brownish necrosis in the peduncle and main branching of the rachis.
The fungus overwinters, as perithecia and pycnidia and also as dormant mycelium in the buds and base of shoots.
The infection starts from the ascospores and pycnidiospores germination, through the base of the shoots or nearer internodes, penetrating in the internal tissues of the xylem.
Pycnidia, small and numerous are formed in the vine shoots.
The ascospores and pycnidiospores are carried by the wind and rain drops.
The rain plays an important role in the melting of the cirrhus that are formed in the pycnidia (the birds and insects are also dispersing agents).
The infection occurs after the bud bursting as a result of the spore germination (ascospores or pycnidiospores) that fall on the young shoots (phenologic stages D and E) and in the zones not ripened or affected by cold wheather in autumn.
Prophylatic and chemical preventive measures similar to those used for Phomopsis viticola .
Phomopsis viticola but this one forms, in the vine shoots, silver coloured stains with black spots (pycnidia) big and scattered, whereas in the M. flaccida the stains are beige with small and numerous spots.
HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.