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Coniothyrium diplodiella (Speg.) Sacc.
Coniella diplodiella (Speg.) Petrak et Sydow

Mycologia, DEUTEROMYCOTINA, SPHAEROPSIDALES .

Crops attacked: grapevine .

[R]Common Names :

White rot

It is a disease of European origin that has spread all over the world.

Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images

[R]Identification
Pycnidia are visible at the naked eye over the wood tissue and all diseased berries.

[R]Description
White spots with dark margins appear in the berries with wounds due to hail or rots, followed by withering and appearance of white pycnidia. In the shoots the bark detaches and the wood becomes covered with pycnidia.

[R]Biology
The fungus overwinters as pycnidia formed on the berries fallen on the ground, surviving for many years.
The fungus penetrates the berries through the wounds; it can also invade young shoots.
The more favourable condition for the attack is high temperature (optimum 24 C), the incubation period being 4-5 days, with formation of pycnidia by the 6th day.

[R]Epidemiology
The spores are dispersed by stormy rain and hail that induce wounds ; hail at the maturation stage contributes to the development of the disease.
Insects and other agents that can cause wounds on berries favour the disease.

[R]Treatement
Chemical treatments after summer stormy rains are recommended, using appropriate products (dicarboximides).

[R]Possible misleading
.

[R] Images

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HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.

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