This Maize update provides guidelines for reducing the risk of maize yield losses caused by Northern leaf blight (Exserohilum turcicum).
Key points
- Northern leaf blight (NLB) is a serious foliar disease of maize in New Zealand and can lead to yield losses of up to 50%.
- NLB overwinters in surface residue; burying residue reduces disease risk.
- Wet, mild weather is required for spread.
- The later the disease appears, the lower the yield loss.
- Use of resistant hybrids is recommended.
- Fungicides may be useful on susceptible hybrids to prevent early infection.