<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) and blight symptoms on laboratory inoculated detached shoots (B, shown here).



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