Soybean Aphid (Aphis glycines)


Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Soybean Aphid

Field Crop Protection Guide 2011-2012, Order 2011-2012 publication

Table of Contents

  1. Integrated Pest Managment Options
    • Seed Treatment
      • thiamethoxam - Cruiser 5 FS
      • thiamethoxam + metalaxyl-M + fludioxonil - Cruiser Maxx Beans
    • Foliar Treatment
      • cyhalothrin-lambda - Matador 120 E, Silencer 120 EC
      • dimethoate - Cygon 480 EC, Lagon 480 EC
      • imidacloprid + deltamethrin - Concept
  2. Related links...

 

Integrated Pest Management Options

Seed Treatment

Foliar treatment at threshold is the recommended method of control. However, seed treatments for the control of other soil insect pests may provide early-season protection (up to 40 days after planting) from early infestations of soybean aphids.

 
Active ingredient thiamethoxam
Trade name Cruiser 5 FS
Rate (product) 83 mL per 100 kg seed
Comments For use in commercial seed treatment facilities only. Provides only early-season protection. Will not protect crop against typical mid-to-late-season aphid infestations. Compatible with Rhizobium-based inculants. Check with inoculant manufacturers for details prior to use. Do not graze or feed livestock on treated areas for 45 days after planting.

 

 
Active ingredient thiamethoxam + metalaxyl-M + fludioxonil
Trade name Cruiser Maxx Beans
Rate (product) 195 mL per 100 kg seed
Comments For use in commercial seed treatment facilities only. Provides early-season protection. Will not protect crop against typical mid-to-late season aphid infestations. Compatible with Rhizobium-based inculants. Check with inoculant manufacturers for details prior to use. Do not graze or feed livestock on treated areas for 45 days after planting.

 


Foliar Treatment

Foliar treatment is the recommended method of control for soybean aphids. Aphid infestations are more likely to cause yield reduction if the plants are already suffering from drought conditions or another stress factor.

Scout fields frequently. Apply foliar insecticide when threshold of "250 aphids per plant with increasing populations" has been reached in the R1-R5 stage of soybeans. If aphid populations do not appear to be on the increase above 250 per plant, do not apply insecticide, as it will kill off the beneficial insects that are keeping the aphid population in check. Aphids are then likely to increase quickly in the absense of their predators and could easily reach threshold.

For further information on scouting techniques, thresholds and management options, see OMAFRA Publication 811, Agronomy Guide for Field Crops.

 
Active ingredient cyhalothrin-lambda
Trade name Matador 120 E
Rate per hectare (product) 83-233mL per ha
Rate per acre (product) 34-94 mL per ac
PHI* 21
Comments Ground and aerial application. For best results, apply during the early morning, before temperatures rise, and during the evening. Use higher rate when conditions favour rapidly increasing populations or when crop canopies are dense, resulting in poor spray coverage. Select nozzle size, type and pressure to produce a medium spray. Use 100-200 L water/ha for ground application, 10-40 L water/ha for aerial application. Maximum 3 applications/yr. 24-hr re-entry period.

 

 
Active ingredient cyhalothrin-lambda
Trade name Silencer 120 EC
Rate per hectare (product) 83 mL per ha
Rate per acre (product) 34 mL per ac
PHI* 21
Comments Ground application only. For best results, apply during the early morning, before temperatures rise, and during the evening. Maximum 3 applications/yr. 24-hr re-entry period.

 

 
Active ingredient dimethoate
Trade name Cygon 480 EC
Rate per hectare (product) 1 L per ha
Rate per acre (product) 400 mL per ac
PHI* 30
Comments Ground and aerial application. Use high volume, high pressure and ensure good coverage. Maximum 3 applications/yr.

 

 
Active ingredient dimethoate
Trade name Lagon 480 EC
Rate per hectare (product) 1 L per ha
Rate per acre (product) 400 mL per ac
PHI* 30
Comments Ground and aerial application. Use high volume, high pressure and ensure good coverage. Maximum 3 applications/yr.

 

 
Active ingredient imidacloprid + deltamethrin
Trade name Concept
Rate per hectare (product) 325-650 mL per ha
Rate per acre (product) 131-263 mL per ac
PHI* 20
Comments Do not apply this product if following a seed treatment or soil application of a Group 4 Insecticide (neonicotinoids) within that season. Ground application only. Use high rate for fastest knockdown and best residual control. Minimum of 5 days between applications. Maximum 3 applications/yr. 24-hr re-entry period.

 


Related links...

 


For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 31 May 2011