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Articles by Hayfa Jabnoun-Khiareddine
Total Records ( 3 ) for Hayfa Jabnoun-Khiareddine
  Fakher Ayed , Mejda Daami-Remadi , Hayfa Jabnoun-Khiareddine and Mohamed El Mahjoub
  Three biological fungicides, Biocont-T, Funga stop and Polyversum constituted, respectively by Trichoderma harzianum, natural extracts (mint oil and citric acid) and Pythium oligandrum, were tested against F. oxysporum f. sp. tuberosi causing potato vascular wilt. Funga stop proved to be the most effective in inhibiting by 72 to 76% the mycelial growth of this pathogen on PDA media after incubation for six days at 25 °C. Biocont-T also limited its development by 37 to 63%. However, Polyversum showed a very little activity in controlling this fungus in vitro. All bio-fungicides reduced disease incidence compared to the untreated control. Funga stop and Biocont-T were the most active during the bioassay. Whereas, Polyversum had a lesser effect in controlling this disease.
  Fakher Ayed , Mejda Daami-Remadi , Hager Jebari , Hayfa Jabnoun-Khiareddine and Mohamed El Mahjoub
  In 2005, a crown and root rot, a yellowing and a death of muskmelon plants were observed in some tunisian melon-growing regions. Isolation was made from diseased tissues. Twelve isolates of Fusarium solani were identified and used to inoculate melon-seedlings by the root dip method for 1 min. These 12 isolates caused typical symptoms of Fusarium crown rot and their pathogenicity indicated that they are identical to Fusarium solani f. sp. cucurbitae. Disease severity on melon-plants, cv. “Ananas d’Amérique”, was estimated by indexes of the leaf damage and crown rot. Analysis of variance revealed significant difference between control and inoculated plants. A significant difference was also observed between some F. solani f. sp. cucurbitae isolates in causing leaf damage and crown rot and a negative effect was observed mainly on plant fresh weight revealing impact of this pathogen on muskmelon growth.
  Hayfa Jabnoun-Khiareddine , Mejda Daami-Remadi , Khaled Hibar , Fakher Ayed and Mohamed El Mahjoub
  In many surveys in the Tunisian Sahel, several isolates of Verticillium have been collected from vegetable crops showing symptoms of Verticillium wilt. These isolates were identified as V. dahliae, V. albo-atrum and V. tricorpus on the basis of their morphological and cultural characteristics. Four isolates of V. dahliae, two isolates of V. albo-atrum and two isolates of V. tricorpus were examined for their mycelial growth at different incubation temperatures and their virulence against tomato and eggplant cultivars. Seedlings at the three leaf stage were root-dipped in a conidial suspension (107 conidia mL-1) and maintained in the glasshouse at 21-25°C. Disease severity was assessed through the index of leaf damage and plant height, recorded eight weeks after inoculation. Growth test showed that the majority of Verticillium isolates were able to grow from 10 to 30°C. All tomato and eggplant seedlings exhibited typical Verticillium symptoms compared to the non-inoculated control. The index of leaf damage, as well as plant height, differs significantly depending on cultivars and isolates. V. albo-atrum and V. tricorpus were moderately to highly pathogenic against eggplant and tomato plants. V. dahliae was the most aggressive against these hosts, showing a high level of pathogenicity to both eggplant and tomato plants.
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