حساسية أصناف مختلفة من نخيل التمر Phoenix dactylifera L للإصابة بالفطر Mauginiells scaettae Cav. المسبب لمرض خياس الطلع

الملخص EN

The present work has been undertaken to evaluate the suscpetability of different cultivars of date palm (Phoenix dactylifera L.) to infection with inflorescence rot disease caused by the fungus Mauginiella scaettae.Results of field survey explained that the highest percentage of infection were found in Shatt-Alarab and Al-Dayer orchards and reached 1.8,2 %, respectively, while the lowest percentage found in Abu-Alkhassieb orchards.

The highest percentage of infection recorded in Green Gannami cultivar which was (6.1 %), while the lowest percentage recorded in Barhee cultivars, the results of study showed a high inhibitiory effect was by the fngal isolates 7 and 8 of M.scaetae on the % viability of pollen grain compared with 92.5 % in control treatment, reduced significantely and reached 35.1%and 48.2 % for two isolates, respectively, the inhibition effect of colony culture filterate of 7 and 8 isolates were the same on the germination of pollen grain.

The results revealed that the tissue extract of different inflorescence cultivars varied in their effect on radial growth inhibitors of isolate 7, the lowest percentage of inhibiton was found in tissue extract obtained from Barhee (15 %), while there was no negative effect with Sayer treatment.

Highest carbohydrate and Tanins content in pollen grain were found in Hillawi, Sayer and Green gannami, while the lowest in Barhee.The highest tanins content recorded in Barhee compared with other cultivars.