Final diagnosis


White mould, Powdery mildew (Golovinomyces cichoracearum var. cichoracearum)

Many lower leaves are covered by a rather thin white feltlike layer. <b><i>Golovinomyces cichoracearum</i> var. <i>cichoracearum</i></b> (oidium, powdery mildew)
Initially there is a multitude of white powdery patches which enlarge and cover gradually the entire lamina. <i>Golovinomyces cichoracearum</i> var. <i>cichoracearum</i> (oidium, powdery mildew)
White, powdery spots which converge on certain parts of the lamina. <i><b>Golovinomyces cichoracearum</b></i> var. <b><i>cichoracearum </i></b>(oidium, powdery mildew)
This fungus, an obligate parasite, disturbs the fonctionning of plant cells which will die; grey to light brown spots can be observed on the lamina. <b><i>Golovinomyces cichoracearum</i> var. <i>cichoracearum</i></b> (white mould, powdery mildew)
Sometimes the fungus develops preferentially in the vicinity of the ribs. <b><i>Golovinomyces cichoracearum</i> var. <i>cichoracearum</i></b> (oidium, powdery mildew)
The fungus also colonises the underside of the leaf ; the white powdery aspect of the patches is visible. <b><i>Golovinomyces cichoracearum</i> var. <i>cichoracearum</i></b> (oidium, powdery mildew).
The patches are in fact formed from the mycelium of the fungus and from a profusion of conidiophores and conidia forming chains. <b><i>Golovinomyces cichoracearum</i> var. <i>cichoracearum</i></b> (oidium, powdery mildew)
<b><i>Golovinomyces cichoracearum</i> var. <i>cichoracearum</i></b> (oidium, powdery mildew) commonly forms conidia chains at the tip of short conidiophores.