​Dr. Tahat specializes in plant pathology, focusing on mycology and bacteriology. His research investigates the interactions between beneficial microbes that support plant protection and the management of plant pathogens. Currently, he is studying soil-borne pathogens affecting forest trees, ornamental plants, crops, vegetables, and weed management within soil ecosystems. A key pro ject involves examining the role of mycorrhizal fungi in managing fungal diseases. Dr. Tahat's work emphasizes the significance of beneficial fungi, such as mycorrhizal fungi and Trichoderma spp. along with other soil microbes, as effective biocontrol agents in plant disease management, soil bioremediation, and plant-pathogen interactions. Furthermore, Dr. Tahat and his team are exploring the critical relationship between soil health, and human health, highlighting sustainable agriculture's importance. Their research addresses how soil health contributes to ecosystem sustainability, impacts climate change on plant health, and promotes overall forest health.