The Stemphylium is a disease mainly air attacking leaflets , rarely petioles and stem, fruit ever known.

Of tiny spots brownish , slightly angular, sometimes unobtrusively halos by a chlorotic border, can be observed on all the leaflets of tomato (Figures 1 and 4). Their size is often limited to a few millimeters, except in particularly humid conditions which favor their extension and their confluence. In this case, they can occupy large portions of the leaf blade. Usually, the spots gradually lighten and eventually take on a grayish tint as they necrotize and dry out . Fruiting of bodies Stemphylium spp. (brown masses corresponding to matured conidia) are visible with a binocular magnifying glass on both sides of the blade. Damaged tissue is dull in appearance and sometimes splits (Figures 3 and 4). During particularly severe attacks, the high density of spots, their increased extension and their confluence induce significant leaf mortalities, preceded by yellowing (figure 5), and more or less substantial leaf drop.

Of rare brown lesions rather limited and longitudinal, are sometimes observed on petioles or on the stem . Severe attacks can occur on seedlings in nurseries in some countries, accompanied by yellowing and defoliation. Note that S. floridanum was described in the 1970s as responsible for blackish lesions on flowers and subsequently on fruits.