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Soybean Sentinel Plot Program

Posted: July 12, 2017

Most soybean fields appear to be growing well and are starting to experience some minor defoliation. Our reports from this week identify bean leaf beetles, Japanese beetles, and grasshoppers as the primary culprits. Remember that vegetative stages soybeans can tolerate up to 25% defoliation without dropping yield, so do not overreact if you find some feeding damage in your fields. For diseases, reports of Septoria brown spot and frogeye leaf spot appeared this week, but populations seem low.

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.

Reports

11 July 2017 – Blair County – Zach Larson

Near Martinsburg

Growth stage: V7-9

  • Japanese beetle – Severity: 1
  • Green cloverworm – Severity: 1
  • No diseases noted

11 July 2017 – Armstrong County – Rachel Milliron

Near Dayton

Growth stage: V6-7

  • Bean leaf beetle – Severity: 1
  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Septoria brown spot – Severity: 1

10 July 2017 – Crawford County – Joel Hunter

Growth stage: V4

  • Minor Japanese beetles feeding
  • Minor infestation of Septoria brown spot

10 July 2017 – Dauphin County – Liz Bosak

Growth stages: V6
  • No significant insect damage
  • Japanese beetles present.
  • No diseases to report.

10 July 2017 – Perry County – Liz Bosak

Growth stages: V1-2
  • Minimal bean leaf beetle feeding
  • Significant grazing from deer
  • No diseases to report.

10 July 2017 – Columbia County – Chris Houser/Joel Imgrund

Growth stage: V5

  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Potato leaf hoppers – Severity: 1
  • No diseases noted

10 July 2017 – Northumberland County – Chris Houser/Joel Imgrund

Growth stage: V5
  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Potato leaf hoppers – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Honey bees and other bees present
  • No diseases noted

10 July 2017 – Union County – Chris Houser/Joel Imgrund

Growth stage: V4

  • Japanese beetle – Severity: 2
  • Grasshoppers – Severity: 1
  • Potato leaf hoppers – Severity: 1
  • No diseases noted

9 July 2017 – Elk County – Nicole Carutis/Mellissa Rathbun

Near Kersey

Field was disked, then soybeans were drilled in 7.5” rows after last year’s corn

Growth stages: V5
  • Bean leaf beetle – Severity: 1
  • Septoria brown spot – Severity: 2
  • Frogeye leaf spot – Severity: 1
  • Downy mildew – Severity: 1

9 July 2017 – Jefferson County – Nicole Carutis/Mellissa Rathbun

Near Brockway

Field was chiseled, Planted, 30” rows, 1st year bean after corn, double Inoculated

Growth stage: VC
  • Bean leaf beetle – Severity: 1
  • No diseases noted

7 July 2017 – York County – John Rowehl/Tom Lockhart

Near Windsor

Growth stage: R1
  • Mexican bean beetles – Severity: 1
  • Japanese beetle – Severity: 1
  • Silver spotted skipper caterpillars – Severity: 1
  • Grasshoppers – Severity: 1
  • No diseases noted

7 July 2017 – York County – John Rowehl/Tom Lockhart

Near southern Stewartstown

Growth stage: R1
  • All insects dead; farmer applied insecticide unnecessarily
  • No diseases noted

7 July 2017 – York County – John Rowehl/Tom Lockhart

Near eastern Stewartstown

Growth stage: V4-5
  • Bean leaf beetle – Severity: 1
  • Japanese beetle – Severity: 1
  • Silver spotted skipper caterpillars– Severity: 1
  • Mexican bean beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • No diseases noted

7 July 2017 – Clinton County – Don Woodring

Near Mill Hall

Growth stage: V3
  • Slugs – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Japanese beetles present
  • Green cloverworms present
  • Grasshoppers – Severity: 1
  • No diseases noted

6 July 2017 – Cambria County – Zach Larson

Near Loretto

Growth stage: V5-7
  • Green cloverworm – Severity: 1
  • No diseases noted

5 July 2017 – Clinton County – Don Woodring

Near Eastville

Growth stage: V3
  • Slugs – Severity: 1
  • Japanese beetles present
  • Silver spotted skipper caterpillars present
  • No diseases noted

3 July 2017 – Columbia County – Chris Houser/Joel Imgrund

Growth stage: V4
  • Japanese beetle – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Honey bees present
  • No diseases noted

3 July 2017 – Northumberland County – Chris Houser/Joel Imgrund

Growth stage: V4
  • Japanese beetle – Severity: 1
  • Silver spotted skipper caterpillars – Severity: 1
  • Honey bees and other bees present
  • No diseases noted

3 July 2017 – Union County – Chris Houser/Joel Imgrund

Growth stage: V3
  • Japanese beetle – Severity: 1
  • Grasshoppers – Severity: 1
  • Frogeye leaf spot – Severity: 2

3 July 2017 – Franklin County – Kelly Patches

Near Greencastle

Growth stage: V8
  • Grasshoppers – Severity: 1
  • Bean leaf beetle – Severity: 1
  • Beneficial arthropods present: spiders, green lacewing, spined soldier bug, lady beetle
  • No diseases notes 

30 June 2017 – Franklin County – Kelly Patches

Near Fayetteville

Growth stage: V2-3
  • Japanese beetle – Severity: 1\
  • Potato leafhopper – Severity: 1
  • Green cloverworm – Severity: 1
  • Grasshoppers – Severity: 1
  • Soybean aphid – Severity: 1
  • Brown marmorated stink bugs – Severity: 1
  • Beneficial arthropods present: lady beetles, spiders
  • No diseases noted

30 June 2017 – Elk County – Nicole Carutis & Mellissa Rathbun

Two fields near Kersey

One field was disked, then soybeans were drilled in 7.5” rows after last year’s corn; other field was no-till drilled in 7.5” rows

Growth stages: V2 to V3
  • Potato leafhopper – Severity: 1 (one field)
  • Japanese beetle – Severity: 1 (one field)
  • Unknown defoliation – Severity: 2
  • Septoria brown spot – Severity: 2

30 June 2017 – Clinton County – Don Woodring

Near Mill Hall

Growth stage: VC
  • Bean leaf beetle – Severity: 1
  • Japanese beetles present
  • Green cloverworms present
  • No diseases noted

28 June 2017 – Clinton County – Don Woodring

Near Eastville

Growth stage: V2
  • Slugs – Severity: 1
  • Japanese beetles present
  • Silver spotted skipper caterpillars present
  • No diseases noted

28 June 2017 – York County – John Rowehl/Tom Lockhart

Near Windsor

Growth stage: V5-6
  • Bean leaf beetle – Severity: 1
  • Japanese beetle – Severity: 1
  • Silver spotted skipper – Severity: 1
  • No diseases noted

28 June 2017 – York County – John Rowehl/Tom Lockhart

Near southern Stewartstown

Growth stage: V6
  • Mexican bean beetle – Severity: 1
  • Silver Spotted Skipper – Severity: 1
  • Japanese beetle – Severity: 1
  • Brown marmorated stink bug – Severity: 1
  • No diseases noted

28 June 2017 – York County – John Rowehl/Tom Lockhart

Near eastern Stewartstown

Growth stage: V2
  • Bean leaf beetle – Severity: 1
  • Japanese beetle – Severity: 1
  • No diseases noted

26 June 2017 – Columbia County – Chris Houser/Joel Imgrund

Growth stage: V3
  • Bean leaf beetle – Severity: 1
  • No diseases noted

26 June 2017 – Northumberland County – Chris Houser/Joel Imgrund

Growth stage: V3
  • Slugs – Severity: 2
  • No diseases noted

26 June 2017 – Union County – Chris Houser/Joel Imgrund

Growth stage: V2
  • Bean leaf beetle – Severity: 1
  • Frogeye leaf spot – Severity: 2