Tomato plants displaying early blight symptoms were collected from different localities in the provinces of Assiut and Sohag, Egypt. The causal pathogens were isolated on potato dextrose agar plates. Pathogenicity tests with 48 isolates were carried out under greenhouse conditions on tomato cultivar (CV 844). All tested isolates caused symptoms of early blight disease with different degrees. The highest disease severity on tomato plants was found after inoculation with isolate No. 6 followed by isolates No. 20 and No. 31. The most pathogenic isolates were identi ed by sequence analysis using ITS1 and ITS4 primers. The analysis of the ampli ed sequences from fungal isolates No. 6, 20 and 31 displayed 99-100% nucleotide identity with Alternaria solani, Curvularia lunata and A. alternata, respectively. To our knowledge, this is the rst report of Curvularia lunata as one of the causal pathogens of early blight disease of tomato plants in Egypt.

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Summary L'accroissement de production des tomates (Lycopersicon esculentum Mill.) de conserverie en semis direct et l'utilisation d'herbicides sélectifs ont entraîné la prolifération de Solanum nigrum L. dans le Sud‐est de la France. Les estimations réalisées sur le terrain ont montré l'action préjudiciable de faibles populations de morelles; un essai a été mis en place afin de déterminer un seuil de nuisibilité. Dans les conditions d'essai, une droite de régression a pu être tracée en fonction de la densité de morelle/m linéaire et du logarithme du rendement.

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