Phomopsis longicolla pycnidia on soybean seed (20 days postincubation on PDA medium).
Rodrigo Pedrozo and Dr. Christopher R. LittleKansas State University, Department of Plant Pathology4024 Throckmorton Plant Sciences Center, Manhattan, Kansas 66506Email: crlittle@ksu.edu
Host: Glycine max (L.) Merr. (soybean)Disease name: Phomopsis seed decayPathogen name: Phomopsis longicolla T. W. Hobbs
Phomopsis longicolla is the primary etiological agent responsible for Phomopsis seed decay, one of the most important seedborne diseases on soybean crops worldwide. Infected seeds are shriveled, cracked, and chalky. This contributes to decreased seed quality, which affects plant stand and results in significant economic losses. When seeds are placed in a humidity chamber, extensive mycelium, pycnidia, and alpha-conidia are evident.
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