This study was designed to investigate the effect of inoculation time with vesicular arbuscular mycorrhizal (VAM) fungi, Glomus spp., on the interaction between root-rot and stem-rot of pepper caused by Sclerotium rolfsii Sacc. as well as its growth. The results indicated that addition of Glomus spp. significantly increased the shoot and root fresh and dry weight with significant decrease to the disease severity (59-89%). Effect of the mycorrhizal inoculation using five species of Glomus by two different inoculation treatments on incidence of Sclerotium stem-rot as well as crop parameters of pepper plants inoculated with the tested fungus was investigated. Generally, mycorrhizal inoculation increased pepper shoot and root fresh and dry weight compared with uninoculated plants. Meanwhile, seedlings arose from seeds treated with Glomus spp. increased growth parameters and yield. G. coronatum and G. luteum were the best mycorrhizae to increase crop parameters. On the other hand, G. etunicatum, G. diaphanum and G. luteum were the best to protect pepper plants against S. rolfsii.