The present work was carried out during 2020 and 2021 successive growing seasons at Sadat City farms, Cairo, Alexandria Desert Road, Menoufia Governorate, Egypt, to study the Effect of Compost on Root Rot Disease Management to Increase Tomato Plants Productivity. Whereas, chemical pesticides might have injury on the environment and human health because it highly toxic substances produced in agricultural led to, great disturbance in biological balance. Rhizoctonia solani and Sclerotium rolfsii were isolated from rotted samples of tomato plants as the main causal pathogens of root rot and damping off diseases. In addition, causing losses on the yield. Adding the different organic matters, i.e. plant residue, cow manure and compost “plant residue + cow manure" to the soil before transplanting tomato at the rate of 1.2 Kg/m² significantly reduced disease incidence and also, increased the percentage of the survived plants compared to control treatment during 2020 and 2021 growing seasons.
      Compost, as tomato rich organic fertilizer at the rate of 1.2 Kg/m2 caused the highest decrease in disease incidence and recorded also, the highest increase in vegetative growth (plant height, no. of brunches/plant and No. of leaves/brunch); yield parameters; flavonoid and total phenol during the two growing seasons. No clear significant differences were noticed between both plant residues and cow manure in respect to plant growth characteristics.