Özet:

In this study, the effects of some Arbuscular Mycorrhizal Fungi (AMF) species (Rhizophagus intraradices (Ri) and Funneliformis mosseae (Fm)) and some essential oils (thyme, mint and sage) on Fusarium oxysporum f. sp. radicis lycopersici (Jarvis & Shoemaker) (FORL) of root and root collar of tomato which are two of the important diseases were invesitigated. In the first stage of study three different essential oils and five different doses of oils (25, 50, 75, 100, 150 μl L-1) have been tested against FORL in-vitro conditions. As a result of the study, it was determined that all doses of essential oils obtained from thyme (KUY) prevented the development of micellar colonies of the pathogen by 50.8-80.8%; and the best dose was 150 μl L-1. In the second stage of the study, 150 μl L-1 dose of KUY was applied to tomato plants grown under in-vivo conditions with AMF species. Although treatment groups did not have a significant effect on plant growth, according to AMF colonization densities and mycorrhizal dependence criteria, the best effect was found with Ri. In the third stage of the study, the effects of 150 μl L-1 dose of KUY and Ri application on FORL in tomato plant were investigated. Ri+KUY+FORL combination was determined to be the most effective group against the pathogen. In addition, although all treatments suppressed the pathogen at a rate of 28-55%, they did not show significant effect on the morphological development of the plant. While the AMF root colonization density Ri and Ri+KUY+FORL treatment groups had the highest values at 43.89% and 37.77% respectively, there was no significant difference in spore density in the rhizosphere Mycorrhizal dependence was detected only in Ri+KUY treatment. As a result, it was determined that Ri and KUY treatments have an important potential in preventing the pathogen, but they do not contribute significantly to plant growth.