Mycologia, DEUTEROMYCOTINA, SPHAEROPSIDALES, PHOMACEAE .
Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images
Silvery grey coloring all around the stem on about a third of its lower end ; medullar tissues are cut in disc shapes ("pile of dishes" symptom) showing a high density of black spheric microsclerotia.
The fungus persits in the soil as microsclerotia and mycelium.
The mycelium penetrates the roots of the young plant and colonizes the lower part of the stem.
Microsclerotia formation takes place at the end of the vegetative cycle of the plant.
The colonization of the tap root and lower stem tissues actually takes place only if the host is in a state of physiological weakness (draught, shallow soil) and if the conditions are favorable to fungus growth, such as high temperature.
Care should be taken to provide proper watering and nutrients (balanced fertilization, irrigation).
Verticilium spp. but in this case the symptoms are localized at the base of the stem and are present throughout the thickness of the stem.
With the draught symptoms (medulla cut in a "pile of dishes" pattern) when unaccompanied by microsclerotia formation.
HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.