Effect of some Bio – control Agents and Agricultural chemicals comparing with Rizolex-T50 in controlling of sclerotium disease and productivity of dahlia plants 1Dept. of Horticulture and 2Dept. of Agric. Botany Fac. of Agric. Moshtohor, Zagazig University (Benha Branch) Egypt. 8th Conf. Agric. Dev. Res., Fac. Agric., Ain Shams Univ., Cairo, November 20-220 Annals Agric Sci. Sp. Issue 4, 1725-1748.