This chapter contains sections titled: Introduction Cuticles and Stomata Hormone Signaling Governs Biotic and Abiotic Stress Responses Roles of ROS at Points of Convergence between Biotic and Abiotic Stress Response Pathways Transcription Factors Involved in the Cross-talk between Abiotic and Biotic Stress Signaling Mitogen-Activated Protein Kinase Cascade Effects of Humidity and Temperature on Biotic Stress Responses Conclusions References