Occurrence and Prevalence of Foliar Diseases on Blueberry in Georgia

Fig. 2. Symptoms and signs of foliar diseases of blueberry in Georgia. Septoria leaf spot: macroscopic symptoms (A) and close-up of a leaf spot showing pycnidia with cirrhi (B). Gloeosporium leaf spot: macroscopic symptoms (C) and close-up of a lesion with acervuli (D). Foliar lesion associated with Pestalotia leaf spot (E); note presence of acervuli in the lesion. Lower surface of a leaf affected by leaf rust (F); note presence of bright colored rust pustules. Phyllosticta leaf spot: macroscopic symptoms (G) and close-up of a leaf spot showing pycnidia (H). Symptoms and signs of algal leaf spot (I). Red discoloration and chasmothecia associated with powdery mildew infection (J); image courtesy A. M. C. Schilder. Non-pathogenic leaf damage: edema-like watersoaking (K), necrotic blotching (L), and sunken, necrotic areas with damaged epidermis on the lower leaf surface (M).



Image from Plant Health Progress article:
Occurrence and Prevalence of Foliar Diseases on Blueberry in Georgia