Osservazioni sulla patogenesi e sulla epidemiologia dell'«avvizzimento» del pomodoro (Lycopersicum esculentummill.) daAlternaria alternataf. sp.Lycopersicigrogan, kimble e misaghi

Alternaria alternataf. sp.LycopersiciGrogan, Kimble and Misaghi is the causal agent of a serious wilt of greenhouse «Earlypak» tomato in Sardinia (Italy). In phytopathological tests this cv. displayed a very high susceptibility both to direct infection and to metabolites effect of the fungus; instead some newly introduced tomato hybrids proved, some more some less, all resistent. The possible infection sources have been found, and so the ways of disease spreading were examined. Finally, some measures in order to prevent the disease are suggested.