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Forages: Alfalfa Blotch Leafminer (Agromyza frontella)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 15 June 2009
Pub 812: Field Crop Protection Guide > Chapter 3: Forages > Alfalfa Weevil

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

Table of Contents

  1. Description
  2. Integrated Pest Management Options
  3. Related links...

Description

The adult is a very small, black, hump-backed fly. The larvae are small, pale yellow maggots found within tunnels in the leaf tissue.

Integrated Pest Management Options

Natural enemies are highly effective at controlling this pest. For the safety of these natural enemies, chemical control is not recommended unless pest population exceeds the action threshold. See OMAFRA Publication 811, Agronomy Guide for Field Crops, for more information

dimethoate – Cygon 480 E, Lagon 480 E
 Cygon 480 ELagon 480 E
Active ingredient dimethoatedimethoate
Trade nameCygon 480 ELagon 480 E
Rate per hectare (product)550 mL per ha550 mL per ha
Rate per acre (product) 220 mL per ac220 mL per ac

Comments (Days to harvest, label precautions, etc.)
Alfalfa only. Ground and aerial application. Do not apply during bloom. Use at least 200 L/ha of water for ground application. Maximum 2 applications/season. 2 days to cutting or grazing.

phosmet – Imidan 50 WP
Active ingredient phosmet
Trade nameImidan 50 WP
Rate (product)2.25 kg per ha (900 g per ac)

Comments (Days to harvest, label precautions, etc.)
Alfalfa only. Do not apply during bloom. Spray when first signs of infestation are visible. 7 days to cutting or grazing.

Related links...

 

For more information:
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Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca