Mycosphaerella and Dothistroma
Brown spot - Mycosphaerella dearnessii
Longleaf pine in the grass stage infected with brown spot.
Each spot on this longleaf pine is from a separate infection.
Lesions caused by brown spot on long leaf pine needles.
Acervuli or conidial stromata being produced on needle lesion. Asexual spores are produced in these structures.
Another photo of the asexual fruiting bodies.
Dothistroma pini ( Mycosphaerella pini) - on pine
Dothistroma needle disease on pine.
Lesions on nedles cause by Dothistroma.
Higher magnification showing lesions on needles of Austrian pine.
Asexual spores are produced from an acervulus (dark fruiting bodies in photo pushing through the needle epidermis).