Typically, these structures are less than one-fourth of the length of leaf hairs. Fungi with fruiting bodies, such as Phoma and Colletotrichum , are best viewed from the top. Angular leaf spot caused by Pseudomonas syringae pv. Alternatia leaf blight, caused by Alternaria cucumerina . A leaf hair is shown for size comparison.
Lesions occur on the upper and lower surfaces of leaves.
The thick part of the spore adjoins the conidiophore, and the beak bears another spore. Note the length of the beaks of conidia with longitudinal and transverse cross-walls. Anthracnose caused by Colleotrichum orbiculare . Downy mildew caused by Pseudoperonospora cubensis . A leaf hair is shown for size and comparison.