الفهرس 
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Abstract
The aim of this work is to study the casual pathogen of inner fruity rotting disease of mango fruits, testing its virulence on some mango cultivates as well as studying the biochemical changes associated with the disease in affected fruits. This work also covers some histological studies concerned with the mode of fungus penetration in mango fruits. Furthermore, the efficiency of some fungicides to control this disease is investigated in the laboratory, as well as, in the field. Diseased mango fruits are obtained during 1980 season. Surface sterilization is solution for one minute, then washed with sterile water. Parts of infected tissue close to the healthy one are transferred to potato dextrose agar (PDA) in petri dishes. The developed fungi are purified with hyphaltip technique. At the same time, a preliminary survey, is carried out during June of 1981, 1982 and 1983 in order to determine the mango fruit dropping, as well as, to detect the susceptibility of the different mango cultivars to this disease under natural conditions in A.R.E.