Suscpetability of different cultivars of Date palm (Phoenix dactylifera L.) to Mauginiella scaettae the causal agent of inflorescnce rot.

Abstract

The present work has been undertaken to evaluate the suscpetability of differentcultivars of date palm (Phoenix dactylifera L.) to infection with inflorescence rotdisease caused by the fungus Mauginiella scaettae.Results of field survey explainedthat the highest percentage of infection were found in Shatt-Alarab and Al-Dayerorchards and reached 1.8 ,2%, respectively, while the lowest percentage found inAbu-Alkhassieb orchards. The highest percentage of infection recorded in GreenGannami cultivar which was (6.1%), while the lowest percentage recorded in Barheecultivars, the results of study showed a high inhibitiory effect was by the fngalisolates 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 twoisolates,respectively ,the inhibition effect of colony culture filterate of 7 and 8isolates were the same on the germination of pollen grain.The results revealed that the tissue extract of different inflorescence cultivarsvaried in their effect on radial growth inhibitors of isolate 7,the lowest percentage ofinhibiton was found in tissue extract obtained from Barhee (15%),while there was nonegative 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 contentrecorded in Barhee compared with other cultivars.