Morphological variability among 35 isolates of Sclerotinia sclerotiorum causing stem and pod rot of beans collected from various localities of EL-Behera governorate were tested. The isolates varied in colony morphology, mycelial growth rate and number, size, weight and color of sclerotia. Isolates were assessed for mycelial compatibility reactions in culture, accordingly, four types of mycelial reactions were observed. Mycelium compatibility was observed among 594 combinations and more than half (569 reactions) of them showed incompatible reactions between several tested pairs of isolates. Based on mycelial compatibility, vegetative compatibility groups (VCGs) were identified among all the tested isolates. However, total of 569 reactions were classified into three cases, 307 gap, 205 line-gap while, 57 exhibited barrage reactions and, 25 combinations showed compatible reaction.