Effect of Mycorhization and Compost on the Growth and the Protection of Date Palm ( Phoenix Dactylifera L .) Against Bayoud Disease.

摘要

In the present study, mycorhization and the use of compost (by-products of the date palm) have beenshown to protect date palm seedlings against bayoud disease. Treatment with Glomus intraradices showed thatthe mycorhization improves the growth of the date palm seedlings from approximately 26%. The presence ofthe pathogenic agent Fusarium oxysporum f.sp. albedinis (Foa) caused a fall of biomass of 82,5% with a deathrate of 100% whereas the presence of mycorhizae caused a drop in this rate mortality to 55%. Also theaddition of the compost to peat (V/V) does not have a notable influence on the growth of the seedlings; onthe other hand, it showed a significant protective effect (55,5%) compared to the all alone peat against theinvasion of pathogenic fungi (Foa). The mycorhization seems to have a positive effect under these conditions.The compost as substrate supports well the growth of the seedlings but does not seem to improve it bycomparing it with the peat and the presence of mycorhizae and does not have any effect. However, thecompost protects the seedlings against the attack from Foa and the mycorhization seems to amplify of 27%this protection.