Trichoderma atroviride and Trichoderma harzianum were tested to see if they could help control Fusarium, a harmful fungus that affects tomato plants. The researchers found that both Trichoderma species were effective in inhibiting the growth of Fusarium, with T. atroviride showing slightly better results. This suggests that using these fungi could be a good way to protect tomato plants from Fusarium wilt, which could help improve crop yield and quality in a sustainable way.