Pathological Studies on Fungal Diseases of Date Palm in New Valley Governorate

Document Type : Original Article

Authors

Plant Pathol. Res. Inst., Agric. Res. Centre, Giza, Egypt

Abstract

During seasons 2010/2011, leaf base rot, black scorch and inflorescences rot diseases have been observed on date palm trees and off-shoot in nurseries and orchards of El-Kharga, Paris, El-Dakhla and El-Farafrah Oases in New Valley Governorate. Disease infection and severity (%) on date palm (var. Saidy) in the surveyed districts were found to be different. Several fungal species belonging to different genera were isolated from diseased samples collected from the surveyed districts. Frequency of the isolated fungi was different according to locality. Pathogenicity tests indicated that Botryodiplodia theobromae was the causal of leaf base rot disease and Thielaviopsis paradoxa was the causal of black scorch and inflorescences rot diseases. Saidy was the highly susceptible variety to leaf base rot followed by var. Higazi which also was the highly susceptible one to black scorch and inflorescences rot diseases, followed by var. Saidy. Meanwhile, var. Tamr was the least susceptible one to all tested diseases. Efficiency of six different fungicides for controlling the diseases in the orchards was tested. Topsin M70, Rizolex-T, Score, Kemazed and Ridomil Gold Plus caused the highest reduction in incidence of leaf base rot, black scorch and inflorescences rot diseases.

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