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Photosynthetic Efficiency Promotion of Sugar Beet by Formulation of Trichoderma and Control of Some Sugar Beet Disease Seedling

Heidi I.G. Abo-Elnaga

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.