Invasive Species Compendium

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Abstract

Distribution of phythopathogenic fungi on the coastal region of Libya and their relationships with date cultivars.

Abstract

A field study was conducted to determine the relationship between date cultivars growing in the coastal region of Libya, and the distribution of fungal genera associated with the trees. The cultivars studied were Helawi, Hura, Bayodi, Brulsi, Tabuni, Bekrari, Ammi, Om-Hnash, Najma, Om-Ftity, Tagyat, Fazani, Tabla, Om-Edam, Akfa, Rahat, Zaglool, Semani, Hamuri and Deglet. There were big differences between date cultivars and it was found that Graphiola phoenicis was most often associated with Tabuni, Helawi, Bekrari, Ammi and Fazani, although it was associated with all cultivars at a lower rate. Black Scorch fungus, Thielaviopsis paradoxa [Ceratocystis paradoxa], was found in association with Helawi, Bekrari, Ammi and Fazani while it was found infrequently on Tabuni. It was recorded that the highest infection rate was on leaves and fruits with 90% and 80%, respectively. The frequency of Diplodia phoenicum was higher in all cultivars studied ranging from 6-61% while the highest distribution on Bekrari, Tabuni, Ammi, Helawi, Hura and Brulsi. Mauginiella scaettae was found only on Bekrari.