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Soybean Sentinel Plot Program

Posted: August 3, 2016

As we receive some much-needed rain, reports continue to indicate very mild insect pressure and little disease. Grasshoppers and Japanese beetles are still the primary defoliators, but populations remain below the economic threshold (15-20% defoliation).

The Pennsylvania Soybean Promotion Board is funding a Soybean Sentinel Plot Program, which is being managed by Penn State Extension and The Department of Entomology at Penn State. In this effort, Penn State Extension Educators are regularly scouting 25 or so ‘typical’ soybean fields in nineteen counties across the state, reporting the populations of plant pathogens and insect pests that they find. Our goal is to keep folks aware of pests so that they will then scout their fields as part of an IPM program. We expect these results to represent the majority of soybean fields in PA, but it would be imprudent to use these reports as the basis or justification for an insecticide application or including insecticides in with a post emergence herbicide application. So it is important to scout your own fields to find out for yourself.

In the reports below, pests that were found during scouting are listed with their severity, which is rated on a 1-10 scale with 10 being the highest. Growers should be sure to check their own fields to determine your local populations, but these reports will give you a sense of what pests are active in fields. Our reports are distributed via this weekly newsletter, Penn State’s Field Crop News, and will be available in the next day or two on Penn State’s Field Crop Entomology website.

This week's reports:

1 August – Bradford County

Mark Madden / Mason Tate

Near Ulster
Growth stage: R2

  • Weeds – Severity: 2
  • Japanese beetle – Severity: 3
  • Grasshopper – Severity: 2

1 August – Columbia County

Chris Houser/Joel Imgrund

Growth stage: R4

  • Bean Leaf Beetle – Severity: 1
  • Grasshopper – Severity: 5
  • Japanese beetle – Severity: 2
  • Honeybees present
  • No disease observed

2 August – Crawford County

Joel Hunter

Growth stage: R2

  • Japanese beetle – Severity: 1
  • Aphids – Severity: less than 1 (recent rain has significantly reduced counts)
  • Spider mites – Severity: less than 1
  • Thrips – Severity: 1

1 August – Dauphin County

Liz Bosak

Growth stage: R2-R4 (four fields)

  • Japanese beetle – Severity: 1
  • Grasshopper – Severity: 1
  • Green cloverworm – Severity: 1
  • Bumblebees present
  • No diseases observed

2 August – Erie County

Joel Hunter

Growth stage: R3

  • Japanese beetle – Severity: 1
  • Aphids – Severity: less than 1 (recent rain has significantly reduced counts)
  • Spider mites – Severity: less than 1
  • Thrips – Severity: 1
  • No diseases observed

28 July – Franklin County

Kelly Patches

Near Greencastle
Growth Stage: R2-3

  • Bean leaf beetle – Severity: 5 (causing about 5-10% defoliation)
  • Potato leaf hopper – Severity: 1 
  • Japanese beetle – Severity: 5 (causing about 5-10% defoliation)
  • Grasshopper – Severity: 1
  • Green cloverworm – Severity: 2
  • Aphids – Severity: 1
  • Frogeye leaf spot – Severity: 1
  • Beneficial insects present: Lady beetles, Orius bugs, damsel bugs, spiders

1 August – Lancaster County

Jeff Graybill

Near Manheim
Growth stage: R3

  • Japanese beetle – Severity: 1
  • Grasshopper – Severity: 3 (10-15% defoliation)
  • Septoria Brown Spot – Severity: 1 (small amount in the lower canopy)
  • Frogeye Leaf Spot – Severity: 1 (small amount in the lower canopy)
  • Few Glyphosate resistant Marestail emerging

1 August – Lancaster County

Emily Heilinge

Growth stage: R2-4

  • Bean leaf beetle: 5% damage
  • Japanese beetle: 10-20% damage
  • Grasshopper: 5% damage
  • Potato leafhopper: 1% damage
  • Stinkbug: 1% damage

1 August – Lebanon County

Emily Heilinge

Growth stage: R4-6

  • Bean leaf beetle: 5% damage
  • Japanese beetle: 10-20% damage
  • Grasshopper: 5% damage
  • Potato leafhopper: 1% damage
  • Stinkbug: 1% damage

1 August – Mercer County

Gary W. Micsky

Growth stage: R4

  • Japanese beetle – Severity: 1
  • Grasshopper – Severity: 1
  • Spider mites – Severity: 1
  • Aphids – Severity: 1
  • Beneficials: honeybees and ladybug beetles present
  • No diseases observed, beans clean, healthy, and vigorous

1 August – Northumberland County

Chris Houser/Joel Imgrund

Growth stage: R4

  • Bean leaf beetle – Severity: 1
  • Grasshopper – Severity: 2
  • Japanese beetle – Severity: 2
  • Bumble bees and other bees present
  • No diseases noted

1 August – Perry County

Liz Bosak

Growth stage: R3-R4 (four fields)

  • Japanese beetle – Severity: 1
  • Grasshopper – Severity: 1
  • Leafhopper – Severity: 1
  • Bumblebees and wasps present
  • No diseases observed

1 August – Potter County

Nicole Carutis/Heather Supplee

No-till, planted 30-in rows
Growth Stage: R1

  • Slugs – Severity: 1
  • Green cloverworm – Severity: 1
  • Phyllosticta leaf spot – Severity: 1
  • Bacterial leaf blight – Severity: 1
  • Frogeye leaf spot – Severity: 1

1 August – Union County

Chris Houser/Joel Imgrund

Growth stage: R4

  • Bean leaf beetle – Severity: 2
  • Grasshopper – Severity: 6
  • Japanese beetle – Severity: 3
  • No diseases noted

29 July - York County

John Rowehl

Growth stage: R2-3

  • Japanese beetle – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Grasshopper – Severity: 1
  • Bacterial blight - Severity: 2

Contact Information

John Tooker
  • Extension Specialist
Phone: 814-865-7082