Abstract
Four isolates of Fusarium sambucinum (Fuckel ) (isolates 1,2,3,4)and four isolates of Fusarium solani ( Mart.) Sacc . (isolates5, 6, 7, 8)were isolated from different localities of sugar beet in Assiut Government .The tested isolated were pathogenic to sugar beet oskarpoly variety causing damping off and root rot. Isolates 2 and5 had the highest pathogen city to sugar beet isolates 3 and 8 had the lowest pathogen city pathogen city. Trichoderma viride have been used for their potential antagonism for controlling Fusarium sp damping off and root rot disease of sugar beet. In vitro studies showed that the culture filtrate of Trichoderma viride significantly decreased the growth of the tested isolates of both Fusarium sambucinum and Fusarium solani Treating the soil with formulation of Trichoderma viride before planting decreased damping off and root rot of sugar beet compared with untreated and untreated soil with formulation of Trichoderma viride under greenhouse conditions during growing seasons 2010and 2011.Chlorophyll a chlorophyll b and total chlorophyll carotenoids decreased when treatment the infested soil with either Fusarium sambucinum or Fusarium solani compared with untreated and untreated soil with formulation of Trichoderma viride.
Highlights
Sugar beet (Beta vulgaris L.) is one of the important sugar crops in Egypt as well as all over the world
Sugar beet is attacked by some Fusarium species causing damping – off and root rot disease which is considered to be one of most destructive and serious disease in many parts of the world as well as in Egypt [1,2,3] Biocontrol technologies have gained momentum in disease control of crop plants in recent times as these technologies minimize of replace the usages of harmful chemical pesticides and found to be cheaper and efficient in certain disease control programmers
Rhizoctonia,Sclerotium,Fusarium,Pythium and Phophthora in several crops have been reported [7] using biological control such as T.viride which is one the efficient biocontrol have been suggested as being responsible for their bio–control activity which includes mycoparasitism, antibiosis, competition for nutrients and space .Secretion of chitinolytic enzymes[8].The major aspects of successful biological control technologies include the establishment of product, formulation and delivery system for microorganism that enable them for efficient disease control .The mass production systems should be complete with industrial and commercial development methods and field application [9] 2010
Summary
Sugar beet (Beta vulgaris L.) is one of the important sugar crops in Egypt as well as all over the world. Data indicate that the T. viride and its filtrate inhibited the growth of the pathogens Fusarium sambucinum(isolates 1,2,3,4) and Fusarium solani, (isolates, 5, 6, 7,8) Tables (4) and (5).
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