Susceptibility of <i>Camellia</i> to <i>Phytophthora ramorum</i>

Fig. 2. Faint ringspot symptoms were barely visible on the upper surface of older leaves of C. japonica ‘Korean Fire’ (upper two leaves), while symptoms on younger leaves were more typical (lower leaf, Fig. 2a). Lesions on the same two older leaves were more obvious on the lower surface (Fig. 2b).

Image from Plant Health Progress article:
Susceptibility of Camellia to Phytophthora ramorum