الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
One the major environmental problems in the fresh water bodies of the tropical countries, The excessive growth of aquatic weed as waterhyacinth Extensive surveys were conducted 2001 to 2003 where accumulation of floating mats of waterhyacinth were located all over Egypt, in 60 sites in about 15 govern orates (Alexandria, ElBehira, Damietta, Dakahlia, KafrElSheikh, PortSaid, Cairo, Elfayoum, BanySuief, ElMinia, Assiut, Sohag, Luxor and Aswan). This study indicated that the most important environmental Factors that may limit distribution and abundance of waterhyacinth are extremes of water salinity, Na+, K+, dissolved oxygen and temperature. Sixty seven fungal isolates belonging to different genera Only 14 of them proved to pathogenic to the target weed and five of them were selected for further studied. The best culture medium for the mycelial growth of the most selected isolates was PYEGA / PYEGB The most efficient carbon source for mycelial growth of the five selected isolates was sucrose the best nitrogen source was Arginine. The emulsion formulation of Alternaria alternata (EPI 39) and Alternaria eichhorniae was successful formulation which increased in the severity of disease on plants and increase in total phenols of waterhyacinth leaves treated with mycoherbicide but led to the reduction in total carbohyderates and total pigments compared to Healthy leaves.