What to look for
Variety specific spot symptoms include
- Very small pale to orange pinprick spots (for example, variety Stirling).
- 1-2 millimetres brown to dark brown spots that may increase in size (for example, variety Vlamingh).
- Brown fingerprint type blotches that may have distinct colours and boundaries or have a water-soaked appearance (for example, variety Baudin).
Generic plant symptoms
- Older leaves are affected first and most severely.
- Spots most commonly develop from stem elongation to flag leaf emergence.
It can be very hard to determine the cause of spotting symptoms in barley- can be physiological, abiotic (nutrient deficiency/toxicity) or disease. Assistance with disease identification can be obtained from DDLS - Plant pathology services (phone +61 (0)8 9368 3721), this is a chargeable service, and can be worthwhile to avoid unnecessary application of fungicide.