Cereals: Barley: Net Blotch (Pyrenophora teres)

Excerpt from Chapter 4, Field Crop Protection Guide, Order this publication

Table of Contents

1. Foliar, Stem and Head Diseases
• pyraclostrobin – Headline EC
• azoxystrobin + propiconazole - Quilt
• propiconazole – Tilt 250 E
• propiconazole – Bumper 418 EC
• prothioconazole - Proline
• trifloxystrobin + propiconazole – Stratego 250 EC
2. Related links...

Foliar, Stem and Head Diseases

Avoid growing barley after barley, wheat or grasses. Plow-down stubble and straw and plant early to avoid serious disease in July.

pyraclostrobin – Headline EC

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Apply only up to flag leaf fully emerged stage (Zadok's 39). Do not apply at boot stage (Zadok's 47) and beyond. Maximum 2 applications/season. Tank-mixing with insecticide is not recommended, as this fungicide could affect insecticide efficacy.

azoxystrobin + propiconazole - Quilt

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Apply once between stem elongation (Zadok’s 29–37) and half-head emergence (Zadok’s 49–55). Maximum 1 application/season. 45 days to harvest for grain or straw. Do not harvest for forage. When expecting high disease pressure from stripe rust, use the higher application rate of 1 L/ha.

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Early application at GS 12–23. For early season disease suppression, use low rate. Use higher rate for field with high disease pressure history or field conditions favourable for disease development. Later application at first sign of disease (GS 29–37) or before head is half emerged (GS 49–55). Apply only the high rate on any
application from GS 29–55. Maximum 2 applications/season. 45 days to harvest.

propiconazole – Bumper 418 EC

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Apply at early signs of disease from the beginning of stem elongation (Zadok’s 29–37). If conditions favourable to disease continue, apply again, if necessary, before head is half emerged (Zadok’s 49–55). 45 days to harvest.

prothioconazole - Proline

Comments (Days to harvest, label precautions, etc.)
Ground application only. Use as a preventative when earliest disease symptoms appear on the leaves and stems. Recommended to be used with the registered non-ionic surfactant, Agral 90 or AgSurf at 0.125% vol/vol. Maximum 2 applications/yr with a minimum 7-day interval between applications. Do not apply within 30 days of harvest.

Comments (Days to harvest, label precautions, etc.)
Spring barley. Ground and aerial application. Maximum 2 applications/year. Do not apply the second application within 14 days of the first. Apply only up to flag leaf fully emerged stage (Zadok's 39). Do not apply at boot stage (Zadok's 47) and beyond. 45 days to harvest

Related links...

• Agronomy Guide for Field Crops - Publication 811
  • Cereal: Spot Blotch
  • Cereal: Net Blotch
• Diseases
• Cereals