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Acta Phytopathologica et Entomologica Hungarica
Authors: M. Belahmar, F. Elkfel, M. Mihoub, S. Abdewahab, M. Mateille and S. Sellami

Surveys were conducted during 2010–2013 in olive growing areas of south and north of Algeria to identify plant parasitic nematodes associated with this crop. Sixteen genera of plant-parasitic nematodes were identified. Among them four are considered as having economic importance for olive. Among these the endoparasites Pratylenchus spp. were detected in the majority of the sampled areas and were the most frequent. Meloidogyne spp. were also present in some areas. Helicotylenchus spp. were present with a high frequency in almost all surveyed sites. Among the ectoparasites, only Xiphinema spp. have potential to damage olive. Other nematodes of less importance were poorly represented. Nematode densities varied according to taxa identified and areas surveyed. Excepted Pratylenchus spp. and Helicotylenchus spp., the others taxa are reported for the first time on olive in Algeria.

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Orobanche foetida is an important new agricultural problem in Tunisia. It has been recently observed on vetch in Morocco showing increased risk of spread. In order to control this new parasite, field trials were conducted during two crop seasons to examine the effect of sowing date on O. foetida infection by using resistant and susceptible faba bean cultivars. The results demonstrated that late sowing reduced significantly the number and the dry weight of emerged O. foetida shoots for the resistant Najeh cultivar but not for the susceptible Badi cultivar. Late sowing (December) also reduced the number of underground tubercles for both cultivars. With December sowing, some attachments reached emergence stage for Badi but not for Najeh showing a delay in the growth of O. foetida on the resistant cultivar. Seed yield increased significantly on late sowing especially for the resistant Najeh cultivar which produces a much higher seed yield than the susceptible Badi cultivar. This can be explained by the reduced number and dry weight of O. foetida attachments and a slight decrease in shoot dry weight of the resistant cultivar. Combining both resistant cultivar with late sowing could be a useful tool as part of an integrated strategy to control O. foetida in Tunisia.

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