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Articles by M. Daami-Remadi
Total Records ( 4 ) for M. Daami-Remadi
  M. Daami-Remadi , F. Ayed , H. Jabnoun-Khiareddine , K. Hibar and M. El Mahjoub
  Several fungicides are tested individually or in dual combination against four Fusarium species causing potato tuber dry rot in Tunisia. Incorporated into the culture media PDA, the tested fungicides significantly inhibited the mycelial growth of all Fusarium species incubated at 25°C for 6 days; a significant interaction was observed between the both fixed factors (p≤0.05). Applied on potato tubers (tuber immersion for 10 min) prior inoculation, all tested fungicides, combined or not, have significantly reduced by more than 50%, comparatively to the untreated controls, the development of dry rot occasioned by Fusarium sp. after 21 days of incubation at 25-27°C. A significant interaction was observed between the treatments and the Fusarium species (p≤0.05). In natural conditions, tuber treatment by the tested fungicides, prior their definitive storage, has reduced dry rot development by about 50%. A synergistic effect was observed in vitro, in vivo and in situ between the mixed fungicides traduced by a better efficacy, in comparison to their individual effects, showing their compatibility and the promotion of the disease control. These combined fungicides could play a role in an integrated pest management against potato tuber-borne pathogens.
  M. Daami-Remadi , H. Jabnoun-Khiareddine , F. Ayed and M. El Mahjoub
  Mycelial growth on PDA of Fusarium graminearum, F. oxysporum f. sp. tuberosi, F. sambucinum and F. solani, causal agents of potato tuber dry rot, depends upon temperatures ranging from 5 to 40°C. An interaction between pathogens tested and temperatures used for culture incubation was observed (at p≤0.05). These Fusarium species showed in vivo both thermal pics of aggressivity: a first one at low temperatures (10-15°C) and a second at higher temperatures (30-35°C). Nevertheless, at temperatures less than 25°C, F. sambucinum and F. graminearum were the most aggressive, while F. solani was the most aggressive at temperatures superior to 30°C.
  M. Daami-Remadi , F. Ayed, , H. Jabnoun-Khiareddine , K. Hibar and M. El Mahjoub
  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.
  M. Daami-Remadi , H. Jabnoun-Khiareddine , F. Ayed and M. El Mahjoub
  Several fungicides were tested against some isolates belonging to four Fusarium species causing potato tuber dry rot in Tunisia. Incorporated into the culture media PDA, the tested fungicides significantly inhibited the mycelial growth, observed after incubation at 25°C for 4 days, of all Fusarium isolates including those of F. sambucinum resistant to benzimidazoles. A significant interaction (p ≤ 0.05) was observed between both fixed factors where inhibition percentage varied depending on tested pathogens and fungicides. Applied on potato tubers (tuber immersion for 10 min) prior inoculation, certain tested fungicides such as azoxystrobin and fludioxonil significantly reduced by more than 50%, comparatively to the untreated controls, the development of dry rot occasioned by F. graminearum and F. sambucinum observed after 21 days of incubation at 25-27°C. A significant interaction (p ≤ 0.05) was noted between the treatments and the Fusarium species traduced by a variable inhibition percentage depending on tested pathogen and fungicides.
 
 
 
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