I quote from BAE SYSTEMS pilots guide ‘Think Ice’
Accretion Efficiency
In general, ice adheres to all forward facing surfaces of the airframe, the accretion rate or catch efficiency being primarily dependent on location and geometry. A relatively large radius aerofoil at moderate or slow airspeeds creates a large pressure wave ahead of the leading edge which forces the air around it, carrying most of the moisture with it. Only droplets sufficiently heavy to overcome this flow will impact the leading edge. Thus, a large chord aerofoil with a blunt leading edge has low ice accretion efficiency.
Conversely, a narrow radius leading edge generates a smaller pressure wave, and so collection efficiency is greater.
In general, the tailplane has a sharper leading edge section and shorter chord than the wing and consequently can accrete ice before it is visible on the wing, and at a greater rate.
The greater mass of rain and drizzle droplets allows them to penetrate the pressure wave, thus giving much higher accretion efficiencies.