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Mycologia, ASCOMYCOTINA, DIAPORTHALES, VALSACEAE .
Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images
[R]Description
On woody parts, small spots with depressed areas and rough skin; flattening and deformations with cracking; desiccation ("die-back" type), with internal necroses, mycelium and tyloses in the medular rays. More severe attacks in the young trees; fruits with reduced dimensions, wrinkled kernel, small and covered with mycelium.
[R]Biology
The fungus can be maintained from one year to another, under the form of sexuated fructifications (perithecia) developed in the stroma or in the cortical tissues, where the vegetative propagation organs (pycnidia) have been formed.
The infection takes place usually as a consequence of the pycnospore germination with penetration through natural wounds, such as the ones resulting from the petal and leaf fall, or from traumatisms of different kinds; in the young fruits the penetration occurs usually through the peduncle.
[R]Epidemiology
The pycnospores are desagregated from the cirrhus by the rain and spread by the action of the avates splashes together with the wind ; insects and birds can also carry the cirrhus.
The infection occurs in the spring and summer, with rainy weather.
[R]Treatement
Dificult to control. Preventive treatments in spring after the rainy periods, using copper products.
HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.
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