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Pasmo is a fungal disease characterized by multi-color stem banding of alternating healthy green tissue and diseased black-brown tissue.  Additionally, circular brown lesions will be present on the leaves.  Pasmo can cause defoliation, early ripening and dropped flax-bolls.  Reduced yields and reduced fiber and seed quality can result with early or severe infections.

Pasmo, Septoria linicola (teleomorph Mycosphaerella linorum), overwinters in infected flax residue.  Moisture and warm temperatures favor Pasmo development.  Also, lodged flax can create a high humidity climate which favors infection.  Raindrops and wind carry the spores onto the flax plant.

Pasmo can be reduced by preventative use of fungicides.  Quadris, Priaxor, and Headline are all labeled for Pasmo. If environmental conditions are favorable for infection, spray timing is at early to mid-flowering according to label instructions.  More fungicide information can be found in North Dakota Field Crop Fungicide Guide (PP-622).   

Sources: "Fungicide Evaluations for Reducing Losses from Pasmo Disease in Flax", Crop and Pest Report 7/5/12, S. Halley, et al.

Flax Council of Canada

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