You are in > Home > SAC Consulting > Consultancy Services > Consultancy Services C - E > Crop Clinic > Disease, Pest & Weed Identification > Diseases > Halo Spot In Barley
Halo Spot In Barley
Selenphoma donacis
General Description
Halo spot of barley is relatively unusual disease, but it has been found throughout Scotland from the Borders up to Orkney. It is caused by the fungus Selenphoma donacis.
Look for pale lesions with a dark brown margin which usually occur on the edges of leaves or the leaf tips. Small brown circular fungal bodies (pydnidia) are found inside the lesions.
Biology
The disease develops in cool wet conditions and is thought to infect leaves via rainsplashed spores. The fungus is present in crop debris in the soil. The flag leaf appears to be the most susceptible leaf. The symptoms may be easily mistaken for other problems, including rhynchosporium, magnesium deficiency or spray scorch.
Advice
You should find that a fungicide progarmme based on a triazole fungicide to targeted rhynchosporium, ramularia or net blotch protection on the upper leaves will effectievly control the disease.
Diary
Resistance Issues
null