Forage: Leaf Spot (Leptosphaerulina trifolii)

Excerpt from Chapter 3, Field Crop Protection Guide, Order this publication

Table of Contents

1. Integrated Pest Management Options
   • Foliar Treatment
     • boscalid – Lance
     • mancozeb – Dithane DG, Rainshield NT
2. Related links...

Integrated Pest Management Options

Timely harvesting of forages is important to reduce leaf loss and minimize disease in the regrowth. There are no practical control strategies available for leaf spot diseases in forages. Balance the time of harvest between the optimum stage for highest protein (bud stage in alfalfa) and the level of leaf spot disease, as leaf spot can reduce the protein level in legume leaves.

Foliar Treatment

Comments (Days to harvest, label precautions, etc.)
For seed production only. Ground and aerial application. Apply at 20%-50% flowering. Apply every 7-14 days if disease persists or weather conditions are favourable for disease development. Do not graze or feed treated hay to livestock. Maximum 3 applications/yr.

Comments (Days to harvest, label precautions, etc.)
For seed production only. Apply prior to 50% bloom. Maximum 3 applications/yr. Repeat 7-10 days after first application and 10 days after second application. Do not graze treated crop or cut for hay.

Related links...

• Agronomy Guide for Field Crops - Publication 811
  • Forage: Common Leaf Spot and Leaf Spot
• Diseases
• Forages