Barley and other grain growers encouraged to remain vigilant for signs of Ramularia leaf spot (July 2017)
is encouraging barley and other grain growers to remain vigilant for signs of
Ramularia leaf spot of barley.
Ramularia leaf spot of barley (Ramularia collo-cygni)
hampers leaf development which can lead to loss of green leaf area in crops,
and can result in yield loss. Symptoms include small brown rectangular
lesions with yellow margins within the leaf veins, visible from both sides of
the leaf but most obvious on the exposed upper leaves after flowering.
Whilst it spreads via spores to nearby hosts, evidence suggests that long
distance spread is limited to infected sown seed.
Growers should be on the lookout for barley plants showing
these symptoms—but note these can be easily confused with net blotch that is
common on other grasses in Australia. The disease is suited to Tasmania’s
cooler climate and it is most common in northern Britain.
Whilst barley is the main host of concern, Ramularia leaf
spot has also been reported on oats and wheat so these are potential secondary
hosts - although less likely to be impacted by the disease.
Ramularia leaf spot was detected on a small plot near Hagley
earlier this year. The detection was immediately responded to with the crop
removed and appropriately disposed of, with the site further treated to remove
the fungus presence. The site remains under ongoing management and
There have been no further detections of the disease at the
site or other areas. Surveillance continues to be undertaken and grain growers
are encouraged to remain vigilant for signs of Ramularia leaf spot.
Biosecurity Tasmania wishes to acknowledge the assistance of
the affected research groups, crop managers and land owners in reporting this
disease promptly and in cooperating with the response work thus far.
What to do if you think you have found Ramularia
leaf spot of barley
Plant Diagnostic Services in Biosecurity Tasmania
will test barley samples suspected of being infected with Ramularia leaf spot
free of charge.
Specimens or images can be submitted to a plant
pathologist - call 1300 368 550 to be directed to a plant pathologist.
Samples of symptomatic barley leaves should be placed in sealed double
plastic bags and sent to: - DPIPWE Plant Diagnostic Services, 13 St John’s Avenue, New Town, TAS 7008
Further information, including images of Ramularia leaf spot of barley
symptoms can be found on the Biosecurity