Final diagnosis


Ragged leaf spot, Phoma leaf blight (Boeremia exigua var. exigua)

Numerous brownish spots, irregularly circular, have appeared on lower leaves. <i>Boeremia exigua</i> var. <i>exigua</i> (<i>Ascochyta nicotianae</i>, ragged leaf spot)
Light brown rounded spots on a lower leaf of tobacco. <b><i>Boeremia exigua</i> var. <i>exigua</i></b> (ragged leaf spot)
The altered tissues are very fragile ; they disintegrate rapidly and fall. The leaf is left with many holes. <b><i>Boeremia exigua</i> var. <i>exigua</i></b> (<i>Ascochyta nicotianae</i>, ragged leaf spot)
On some leaves the spots are of light brown to ashy grey and tend to coalesce. <b><i>Boeremiaexigua</i> var. <i>exigua</i></b> (<i>Ascochyta nicotianae</i>, ragged leaf spot)
Several tiny black dots can be easily observed : they are the pycnidia of the fungus. <b><i>Boeremia exigua</i> var. <i>exigua</i></b> (<i>Ascochyta nicotianae</i>, ragged leaf spot)