Phomopsis longicolla is a species of ascomycete fungus in the family Diaporthaceae.

It is a plant pathogen and mainly responsible for a soybean disease called Phomopsis seed decay (PSD).

[2] P. longicolla has been found to produce a number of cytotoxic and antimicrobial secondary metabolites, especially members of the class of phomoxanthones.

[3][4] P. longicolla was first described in 1985 by Thomas W. Hobbs et al. at the Department of Plant Pathology at Ohio State University.

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