<i>Phytophthora ramorum</i> Infects Hazelnut, Vine Maple, Blue Blossom, and Manzanita Species in California

Fig. 2. Phytophthora ramorum petiole symptoms on vine maple, Acer circinatum, from natural infection (A, shown here) and blight symptoms on laboratory inoculated detached shoots (B).



Image from Plant Health Progress article:
Phytophthora ramorum Infects Hazelnut, Vine Maple, Blue Blossom, and Manzanita Species in California