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Soybean Sentinel Plot Program

Posted: July 27, 2016

Our reports continue to indicate very mild insect pressure, and still very little disease has been reported.

Grasshoppers and Japanese beetles continue to gain attention in fields, but based on defoliation damage, all our populations are below the economic threshold even if the plants are in their reproductive stage (15-20% defoliation). 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 Report

26 July – Crawford County

Joel Hunter

Growth stage: R3

  • Japanese Beetle – Severity: 1
  • A few aphids
  • No disease observed, some sun scald, generally healthy appearance.

26 July – Erie County

Joel Hunter

  • Growth stage: R2
  • Japanese Beetle – Severity: 1
  • A few aphids
  • No disease observed, generally healthy appearance.

25 July – Franklin County

Kelly Patches

Near Greencastle
Growth Stage: R1-2

  • Bean leaf beetles – Severity: 1 (causing about 5% defoliation)
  • Potato leaf hopper – Severity: 1 
  • Japanese beetles – Severity: 3 (causing about 5-10% defoliation)
  • Grasshoppers – Severity: 1
  • Green cloverworm – Severity: 1
  • Beneficials present: Honey bees, lady beetles, minute pirate bugs (Orius), damsel bugs, spiders present

26 July – Mercer County

Gary Micsky

Growth stage: R3

  • Japanese Beetle – Severity: 1
  • Grasshopper – Severity: 1
  • Spider mites – Severity: 1
  • Aphids – Severity: 1
  • Lady beetles and honey bees present
  • No diseases noted

25 July – Columbia County

Chris Houser/Joel Imgrund

Growth stage: R3

  • Grasshoppers – Severity: 2
  • Japanese beetles – Severity: 2
  • Honey bees present

25 July – Northumberland County

Chris Houser/Joel Imgrund

Growth stage: R3

  • Potato leaf hopper – Severity: 1
  • Grasshoppers – Severity: 2
  • Japanese beetles – Severity: 1
  • Many honey and bunble bees present
  • No diseases noted

25 July – Union County

Chris Houser/Joel Imgrund

Growth stage: R3

  • Bean leaf beetle – Severity: 1
  • Grasshoppers – Severity: 2
  • Japanese beetles – Severity: 3
  • No diseases noted

25 July – Bradford County

Mark Madden/Mason Tate

Near Ulster
Growth stage: R1-2

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

25 July – Potter County

Nicole Carutis/Heather Supplee

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

  • Bean Leaf Beetle – Severity: 1
  • Japanese Beetle – Severity: 1
  • Phyllosticta Leaf Spot – Severity: 1
  • Septoria – Severity: 1
  • Downy Mildew – Severity: 1

25 July – McKean County

Nicole Carutis/Heather Supplee

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

  • Grasshopper nymphs – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Green cloverworm – Severity: 1
  • Bacterial leaf wilt – Severity: 1
  • Septoria – Severity: 1

25 July – Elk County

Nicole Carutis/Heather Supplee

No-Till, Drilled
Growth Stage: V5

  • Japanese Beetle – Severity: 1
  • Green cloverworm – Severity: 1
  • Grasshopper nymphs – Severity: 1
  • Septoria – Severity: 1
  • Frogeye Leaf Spot – Severity: 1
  • Phyllosticta Leaf Spot – Severity: 1

21 July – Clinton County

Don Woodring

Two fields
Growth stage: One field at V6, the other at R2-3

  • Bean leaf beetle – Severity: 3
  • Grasshopper – Severity: 2
  • Japanese beetle – Severity: 2
  • Green cloverworm – Severity: 1
  • Brown stinkbug – Severity: 1
  • No diseases noted

19 July – Bradford County

Mark Madden/Mason Tate

Near Ulster
Growth stage: R1

  • Japanese beetle – Severity: 1
  • Grasshopper – Severity: 1

19 July – York County

John Rowehl

Growth stage: R2

  • Japanese beetles – Severity: 1
  • Mexican Bean beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Brown stink bug – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Bacterial blight – Severity: 1

Contact Information

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