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Forage: Leaf Spot (Leptosphaerulina trifolii)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 28 July 2007
Pub 812: Field Crop Protection Guide > Chapter 4 : Forages > Leaf Spot

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

Table of Contents

  1. Integrated Pest Management Options
  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. Leaf spots can reduce the protein level in legume leaves, so it is important to balance the time of harvest between the optimum stage for highest protein (bud stage in alfalfa) and the level of leaf spot disease.

Foliar Treatment
boscalid – Lance
Active Ingredient boscalid
Trade Name Lance
Rate per hectare (product) 420 g per ha
Rate per acre (product) 170 g per ac

Comments
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 of 3 applications per year.

mancozeb – Dithane DG, Rainshield NT
  Dithane DG Rainshield NT
Active ingredient mancozeb mancozeb
Trade name Dithane DG Rainshield NT
Rate per hectare (product) 1.46 kg per ha 1.46 kg per ha
Rate per acre (product) 584 g per ac 584 g per ac

Comments
For seed production only. Apply prior to 50% bloom. Maximum of 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.

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