Septoria leaf spot of flax

Symptoms

Small brown spots with grey centers on leaves + stems, lesions expand into elongate brown blotches, severe infection causes premature defoliation + fibre quality loss, stem cankers reduce fibre length in fibre flax, infected seed perpetuates disease.

Plants affected

• flax / linseed

Common questions

How do I recognise Septoria leaf spot of flax on flax / linseed?

Small brown spots with grey centers on leaves + stems, lesions expand into elongate brown blotches, severe infection causes premature defoliation + fibre quality loss, stem cankers reduce fibre length in fibre flax, infected seed perpetuates disease.

Do I have to report Septoria leaf spot of flax?

No. Septoria leaf spot of flax is not a notifiable organism, so there is nothing to report to an authority. Treat it as a normal garden problem.

How is Septoria leaf spot of flax treated?

Mainly with biological and cultural measures — removing affected material, changing the conditions that favour it, and treating with agents approved in your country. The exact steps and their timing depend on the plant, the season and where you live: Dr. Phyto works them out in a free diagnosis.