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Description and Symptoms
 Net blotch lesions first appear as light brown patches with a pattern of dark brown inside them.
The dark brown pattern of net blotch lesions takes on a net-like pattern characteristic of the disease. Surrounding areas become yellow.
Net blotch lesions can spread over an entire leaf and kill it.
The fungus overwinters on seed or on plant residue in the soil.
Net blotch is most common in cool weather and can be found from early growth stages through maturity.
Severe attacks occur mainly after flag leaf emergence causing premature leaf death.
Wet weather provides favorable conditions for disease development.
Lush vegetative growth can encourage disease development.
Integrated Management
Rotate out of barley two years to reduce inoculum in the soil.
Eliminate surface crop residue to help reduce net blotch.
Plant resistant varieties when available.
Avoid excessive nitrogen rates that cause lush vegetative growth favoring net blotch development.
Decrease irrigation frequency to allow foliage to dry between irrigations.
Apply fungicides in severe cases especially to protect the flag leaf.
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