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Soybean Sentinel Plot Program

Posted: July 20, 2016

Our reports continue to indicate very mild disease and insect pressure.

Current report:

Grasshoppers and Japanese beetles are the main pests that our scouts encountered in the last week, though spider mites have made their first appearance this week, which is worth noting; see the other article in this newsletter for details on spider mites. Still very little disease has been reported. We expect these results to represent the majority of soybean fields in PA, but scout your fields to find out for yourself.

The Pennsylvania Soybean Promotion Board is funding a Soybean Sentinel Plot Program, which is being managed by Penn State Extension and The Dept. 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. 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.

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.

Scouting Reports

19 July – Schuylkill County

Dwane Miller

Growth stage: R2

  • Japanese beetle – Severity: 1
  • Grasshopper – Severity: 1
  • Septoria Brown Spot present but very limited

19 July – Crawford County

Joel Hunter

Growth stage: R1

  • Japanese Beetle – Severity: 1
  • Aphid counts significantly reduced since last report (attributed to recent showers)
  • No disease observed, some sun scald, generally healthy appearance.

19 July – Erie County

Joel Hunter

Growth stage: R2

  • Japanese Beetle – Severity: 1
  • Aphid counts significantly reduced since last report (attributed to recent showers)
  • No disease observed, generally healthy appearance.

18 July – Potter County

Nicole Carutis/Heather Supplee

No-till, planted 30-in rows
Growth Stage: V5

  • Green cloverworm – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Soybean Blight – Severity: 1
  • Septoria – Severity: 1
  • Downy Mildew – Severity: 1
  • Phyllosticta Leaf Spot – Severity: 1

18 July – McKean County

Nicole Carutis/Heather Supplee

Disked, Planted, 15 inch rows, 2nd year beans
Growth Stage: R1

  • Grasshopper nymphs – Severity: 1
  • Green cloverworm – Severity: 1
  • Bacterial Blight – Severity: 1
  • Septoria – Severity: 1
  • Frogeye Leaf Spot – Severity: 1

18 July – Elk County

Nicole Carutis/Heather Supplee

No-Till, Drilled
Growth Stage: V5

  • Japanese Beetle – Severity: 1
  • Green Cloverworm – Severity: 1
  • Soybean Leaf Miner – Severity: 1
  • Septoria – Severity: 1
  • Downy Mildew – Severity: 1

18 July – Columbia County

Chris Houser/Joel Imgrund

Growth stage: R2

  • Grasshoppers – Severity: 2
  • Japanese beetles – Severity: 2
  • Bean pod mottle virus – Severity: 2

18 July – Northumberland County

Chris Houser/Joel Imgrund

Growth stage: R2

  • Grasshoppers – Severity: 1
  • Many honey bees present
  • No diseases noted

18 July – Union County

Chris Houser/Joel Imgrund

Growth stage: R1

  • Grasshoppers – Severity: 3
  • Japanese beetles – Severity: 2
  • Green cloverworm – Severity: 1
  • No diseases noted

17 July – Mercer County

Gary Micsky

Growth stage: R3

  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Lady beetles and honey bees present
  • No diseases noted

15 July – Franklin County

Kelly Patches

Near Greencastle
Growth Stage: R1

  • Bean leaf beetles – Severity: 1
  • Potato leaf hopper – Severity: 1
  • Japanese beetles – Severity: 3
  • Soybean aphids – Severity: 1
  • Grasshoppers – Severity: 1
  • Spider mites – Severity: 1
  • Honey bees, lady beetles, spiders present

15 July – Dauphin County

Liz Bosak

Four fields
Growth stage: V3 to R2

  • Japanese beetles – Severity: 1
  • Grasshoppers – Severity: 1
  • Green cloverworm – Severity: 1
  • Silver spotted skipper – Severity: 1
  • Diseases: none to report

14 July – Perry County

Liz Bosak

Four fields
Growth stage: R1 to R2

  • Japanese beetles – Severity: 1
  • Grasshoppers – Severity: 1
  • Diseases: none to report

14 July – York County

John Rowehl

Growth stage: R2

  • Mexican been beetle – Severity: 1
  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Bacterial blight present deep in the canopy

14 July – Clinton County

Don Woodring

Two fields
Growth stage: One field at V5, the other at V6-R1

  • Slugs – Severity: 1
  • Bean leaf beetle – Severity: 2
  • Grasshopper – Severity: 2
  • Japanese beetle – Severity: 2
  • Green cloverworm – Severity: 1
  • A few brown stink bug present
  • No diseases noted

Contact Information

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