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Journal of Plant Sciences
Year: 2006  |  Volume: 1  |  Issue: 4  |  Page No.: 306 - 314

Comparative Susceptibility of Some Local Potato Cultivars to Four Fusarium Species Causing Tuber Dry Rot in Tunisia

M. Daami-Remadi, F. Ayed,, H. Jabnoun-Khiareddine, K. Hibar and M. El Mahjoub    

Abstract: Comparative susceptibility of local potato cultivars to Fusarium graminearum, F. sambucinum, F. solani and F. oxysporum f.sp. tuberosi, causing tuber dry rot is investigated in the current study for the first time in Tunisia. Obtained results revealed that these Fusarium species showed variable aggressivity upon the 11 tested potato cultivars. In fact, F. graminearum was the most aggressive on the majority of cultivars; F. sambucinum, F. solani and F. oxysporum f.sp. tuberosi, showed a comparable aggressivity on some used cultivars. After 21 days of incubation at 25-27°C, all inoculated tubers of all cultivars showed dry rot symptoms with different degree revealing that cultivar’s resistance was distinct against F. oxysporum f.sp. tuberosi, F sambucinum, F. graminearum and F. solani. Furthermore, no cultivars were completely resistant to the whole Fusarium complex and only some cultivars showed a lesser susceptibility to at least two species this is the case for Mondial and Spunta against F. sambucinum and F. oxysporum f.sp. tuberosi and the case of Liseta against F. graminearum and F. oxysporum.

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