• Forecasting Apple Scab (Venturia inaequalis):
• Mills' Infection Periods: The classical disease forecasting system developed by W. D. Mills (1944) determines the occurrence of primary ascospore infection based on three environmental parameters:
• Temperature: Average temperature during the wet period governs fungal germination and penetration rates.
• Relative Humidity (High RH hours): High atmospheric humidity is required for perithecial maturation and ascospore release.
• Leaf wetness hours: Ascospores require a continuous film of free water on leaf surfaces (e.g., 9 hours at $17-24^\circ\text{C}$) to successfully penetrate the cuticle.
• Exclusion: Cultural practices are management strategies, not dynamic weather inputs into the predictive forecasting model.
• Conclusion: Inputs (A), (B), and (C) only are required (Option 2).

Correct option: (2) (A), (B) and (C) only,