back to HYPP Pathologyhome page
back to HYPP Pathology
Mycologia, ASCOMYCOTINA, DOTHIDEALES, DOTHIDEACEAE .
Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images
[R]Description
On leaves the disease shows isolated necrotic areas.
In summer, elongated brown or purplish-red necroses occur on the young shoots around the buds starting about 30 cm above the ground.
In autumn, the surface of the canes is marked by little black dots (perithecia) and becomes silvery grey.
The following year the buds hardly open or are stunted, the flowers dry out, which results in severe yield loss at harvest.
The disease causes important loss if the plantation is overgrown or weed-infested.
[R]Biology
The fungus first infects the adult or senescent leaves and in late summer attacks the canes where it produces perithecia and picnidia.
Ascospores are released in spring and early summer while pycnidiospores are disseminated from spring to autumn.
[R]Epidemiology
Serious damage usually occurs after warm springs.
[R]Treatement
Use tolerant cultivars.
Cut away and burn the infected shoots after harvesting.
Ensure good ventilation and sanitation of the plantations.
Use the locally recommended treatment but with alternate chemicals to avoid development of resistant strains.
HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.
back to HYPP Pathology home page