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Soybean Sentinel Plot Program

Posted: August 2, 2017

Reports continue to indicate very mild insect pressure and little disease as soybeans across the state continue to bloom and are starting to form pods. Japanese beetles and bean leaf beetles are the primary defoliators, but populations remain below the economic threshold (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 Reports

30 July – Armstrong County – Rachel Milliron

Near Dayton

Growth Stage: R2

  • Japanese beetles – Severity: 3
  • Bean leaf beetle – Severity: 2
  • Grasshoppers – Severity: 1
  • Septoria brown spot – Severity: 1
  • Beneficials present: honeybees, bumblebees, spiny soldier beetles, spotted lady beetles

28 July – Blair County – Zachary Larson

Near Martinsburg

Growth Stage: R3

  • Japanese beetles – Severity: 1
  • Cloverworm – Severity: 1
  • Grasshoppers – Severity: 1
  • Brown spot – Severity: 1

28 July – Cambria County – Zachary Larson

Near Loretto

Growth Stage: R2

  • Japanese beetles – Severity: 1
  • Cloverworm – Severity: 1
  • Frogeye spot – Severity: 1
  • Bacterial leaf blight  – Severity: 1
  • Brown spot  – Severity: 1

31 July – Crawford County – Joel Hunter

Near Saegertown

Growth Stage: R2

  • Japanese beetles – Severity: 1
  • Bean leaf beetles – Severity: 1
  • Green cloverworm – Severity: 1
  • Brown spot  – Severity: 1

30 July – Elk County – Melissa Rathbun

Near Kersey

Field was disked, then soybeans were drilled in 7.5” rows after last year’s corn. Some damage was caused by a spray (round-up) application.

Growth Stage: R2

  • Japanese beetles – Severity: 2
  • Bean leaf beetles – Severity: 1
  • Green cloverworm – Severity: 1
  • Frogeye leaf spot – Severity: 1
  • Bacterial leaf blight – Severity: 1
  • Septoria brown Spot – Severity: 1

27 July – Franklin County – Kelly Patches

Near Greencastle

Growth Stage: R3

  • Bean leaf beetles – Severity: 5
  • Japanese beetles – Severity: 3
  • Green cloverworm – Severity: 1
  • Potato leafhopper – Severity: 1
  • Aphids - Severity: 1
  • Grasshoppers – Severity: 1
  • Silver spotted skipper – Severity: 1
  • Beneficials present: spiders

30 July – Jefferson County – Melissa Rathbun

Near Brockway

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

Growth Stage: V4

  • Japanese beetles – Severity: 1
  • Bean leaf beetles – Severity: 1
  • Grasshopper – Severity: 1
  • Potato leafhopper – Severity: 1
  • Soybean leaf miner – Severity: 1
  • Frogeye leaf spot – Severity: 1
  • Beneficials present: spiders

26 July – York County – John Rowehl

Near Southern Stewartstown

Growth Stage: R3

  • Damage level: 1
  • Pests found: Japanese beetles, bean leaf beetles, Mexican bean beetle

26 July – York County – John Rowehl

Near Eastern Stewartstown

Growth Stage: R1-R2

  • Damage level: 1
  • Pests found: Japanese beetles, bean leaf beetles, Mexican bean beetles, grasshoppers

26 July – York County – John Rowehl

Near Windsor

Growth Stage: R3

  • Damage level: 1
  • Pests found: Japanese beetles, bean leaf beetles, Mexican bean beetles/larvae, grasshoppers, green cloverworm, brown marmorated stink bugs, green stink bugs, silver spotted skippers