Tomato is a globally vital crop with annual production exceeding 180 million tons. However, fungal and pest-induced diseases cause 20-40% yield losses worldwide. This paper proposes MambaCNN, a novel hybrid architecture combining state space models with convolutional networks for tomato leaf disease classification. Our approach achieves 93.7% accuracy on a 5-class dataset through synergistic global-local feature fusion, outperforming standalone CNNs (85.9%) and Mamba Vision (88.2%). The framework demonstrates particular effectiveness in handling fine-grained visual patterns and long-range disease progression contexts