There are two types of net blotch differentiated by the symptoms: a net form and a spot form. Both occur in NZ but the net form is more common.
Look out for:
- Net like symptoms, especially in 2nd year barley crops
- Infected stubble or seed
- Cool, moist conditions
Infection can be seed borne or from infected stubble.
Net blotch favours cool, moist conditions.
Yield losses of 10-30% have been recorded.