Soybean Board Sentinel Plot Program August 22, 2017

Reports this week from across Pennsylvania continue to indicate low pest populations in the soybean fields we are scouting.
Soybean Board Sentinel Plot Program August 22, 2017 - News

Updated: November 15, 2017

Soybean Board Sentinel Plot Program August 22, 2017

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. A severity score of 1 equates to 10% or less infestation or defoliation, a "2" aligns with 20% or less infestation or defoliation, and so on. 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.

Most of our fields are in the mid-reproductive stage (R4-5) and a lot of insect damage becomes inconsequential after R5, so keep this in mind. Our reports from this week identify Japanese beetles, and grasshoppers as the primary defoliators, but aphids and brown marmorated stink bugs are present in some fields. For diseases, reports of Septoria brown spot and frogeye leaf spot are present in some fields, but pest pressure remains low.

Reports

22 August 2017 - Lancaster County- Jeff Graybill

Growth stage: R5

  • Japanese beetle - Severity: 2
  • Bean leaf beetle - Severity: 3 (significant numbers but little feeding damage)
  • Grasshoppers - Severity: 1
  • White mold (Sclerotinia Stem Rot) - Severity: 3 (wet spots are affected with rotted stems, sudden wilt and death of individual plants)
  • Frog eye leaf spot - Severity: 1
  • Dozens of Barn Swallows flying field daily to catch insects, not seeing many beneficial insects.

22 August 2017 - Dauphin County - Liz Bosak

Growth stage: R4

  • Japanese beetle - Severity: 1
  • No diseases noted

21 August 2017 - Franklin County - Kelly Patches

Near Greencastle

Growth stage: R4

  • Soybean aphid - Severity: 1
  • Bean leaf beetle - Severity: 1
  • Grasshoppers - Severity: 1
  • Green cloverworm - Severity: 1
  • Japanese beetle - Severity: 1
  • Potato leaf hopper - Severity: 1
  • Beneficial arthropods present: spiders
  • No diseases noted

21 August 2017 - Franklin County - Kelly Patches

Near Fayetteville

Growth stage: R5

  • A few weeks ago, field was sprayed with a post-emergent herbicide, and they unnecessarily include an insecticide
  • Grasshoppers - Severity: 1
  • Beneficial arthropods present: spiders, bees
  • No diseases noted

21 August 2017 - Armstrong County - Rachel Milliron

Growth stage: R4

  • Japanese beetle - Severity: 2
  • Bean leaf beetle - Severity: 2
  • Grasshoppers - Severity: 2
  • Septoria brown Spot - Severity: 1
  • Frog eye leaf spot - Severity: 1

21 August 2017 - Crawford County - Joel Hunter

Growth stage: R5

  • Japanese beetle - Severity: 1
  • Grasshoppers - Severity: 1
  • Green cloverworm - Severity: 1
  • Septoria brown spot - greatly reduced compared to previous weeks

21 August 2017 - Columbia County - Chris Houser/Joel Imgrund

Growth stage: R5

  • Japanese beetle - Severity: 1
  • Grasshoppers - Severity: 2
  • Bean leaf beetle - Severity: 1
  • Soybean aphid - Severity: 1
  • No diseases noted

21 August 2017 - Northumberland County - Chris Houser/Joel Imgrund

Growth stage: R5

  • Japanese beetle - Severity: 1
  • Grasshoppers - Severity: 3
  • Soybean aphid - Severity: 1
  • Downy mildew - Severity: 2
  • No diseases noted

21 August 2017 - Union County - Chris Houser/Joel Imgrund

Growth stage: R5

  • Japanese beetle - Severity: 2
  • Grasshoppers - Severity: 3
  • Bean leaf beetle - Severity: 2
  • No diseases noted

20 August 2017 - Elk County - Nicole Carutis/Mellissa Rathbun

Growth stages: R3

  • Japanese Beetle - Severity: 1
  • Grasshopper - Severity: 1
  • Green Clover worm - Severity: 1
  • Bean leaf beetle - Severity: 1
  • Frogeye Leaf Spot - Severity: 1

20 August 2017 - Jefferson County - Nicole Carutis/Mellissa Rathbun

Growth stage- R2

  • Japanese Beetle - Severity: 1
  • Bean Leaf Beetle - Severity: 1
  • Grasshopper - Severity: 1
  • Green Stink Bug - Severity: 1
  • Green Clover worm - Severity: 1
  • Frogeye Leaf Spot - Severity: 1
  • Bacterial leaf blight - Severity: 2

17 August 2017 - Clinton County - Don Woodring

Near Eastville

Growth stage: R5

  • Japanese beetle - Severity: 1
  • Grasshopper - Severity: 2
  • Bean leaf beetle - Severity 1
  • Green cloverworm - Severity 2
  • Brown stinkbug - Present
  • Green stinkbug - Present
  • Potato leafhopper - present
  • No diseases noted

17 August 2017 - Clinton County - Don Woodring

Near Mill Hall

Growth stage: R3-4

  • Green cloverworm - Severity 2
  • Japanese beetle - Severity 1
  • Grasshopper - Severity 3
  • Bean leaf beetle - Severity 1
  • Green stinkbug - Severity 1
  • Soybean aphid - Present
  • Bean leaf beetle - Present
  • Beneficial insects present: Lady beetles
  • Downy mildew - Severity 1

16 August 2017 - York County - John Rowehl/Tom Lockhart

Near southern Stewartstown

Growth stage: R5

  • General defoliation - Severity: 2
  • Herbivores active:
    • Bean leaf beetle
    • Grasshoppers
    • Silver-spotted skipper caterpillars
    • Japanese beetle
    • Green cloverworm
    • Cucumber beetles
  • Mexican bean beetles
  • No diseases noted

16 August 2017 - York County - John Rowehl/Tom Lockhart

Near eastern Stewartstown

Growth stage: R4/5

  • General defoliation - Severity: 1
  • Herbivores active:
    • Japanese beetle
    • Mexican bean beetles
    • Grasshoppers
    • Brown marmorated and green stink bugThrips
    • Cucumber beetles
    • Green cloverworm
    • Silver-spotted skipper caterpillars
  • No diseases noted

16 August 2017 - York County - John Rowehl/Tom Lockhart

Near Windsor

Growth stage: R5

  • General defoliation - Severity: 1
  • Herbivores active:
    • Japanese beetle
    • Grasshoppers
    • Bean leaf beetles
    • Green stink bug
    • Green cloverworm
  • No diseases noted

14 August 2017 - Perry County - Liz Bosak

Growth stage: R3

  • Japanese beetle - Severity: 1
  • Grasshopper - Severity: 1
  • Bumble bees and lady beetles present
  • No diseases noted
  • Extensive deer damage continues

Authors

Insect ecology Plant-insect interactions Conservation biological control Chemical ecology Gall insects

More by John Tooker, Ph.D.