Mycosphaerella and Dothistroma

Needle Diseases

Brown spot - Mycosphaerella dearnessii

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Longleaf pine in the grass stage infected with brown spot.

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Lesions caused by brown spot on long leaf pine needles.

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Acervuli or conidial stromata being produced on needle lesion. Asexual spores are produced in these structures.

Dothistroma pini ( Mycosphaerella pini) - on Austrian and Ponderosa pine

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Dothistroma needle disease on ponderosa pine.

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Asexual spores are produced in an acervulus.