Soybean Sentinel Plot Program, August 30th Update

Reports this week from across Pennsylvania continue to indicate low pest populations in the soybean fields we are scouting.
Soybean Sentinel Plot Program, August 30th Update - News

Updated:

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 (R4-6) 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

August 27, 2017 – Armstrong/Dayton – Rachel Milliron
Growth Stage: R5

  • Frog-3
  • BLB-3
  • Jap Beetle-4
  • Grasshoppers-2
  • Septoria-1

August 28, 2017 – Beockway – Mellissa Strong
Growth Stage: R4

  • Frogeye leaf spot- Severity: 1
  • Japense Beetle- Severity:1
  • Grasshopper- Severity: 1
  • Green Stink Bug- Severity: 1
  • Bean leaf beetle- Severity: 0.5

August 28, 2017 – Blair (Near Martinsburg) – Zachary Larson
Growth Stage: R6

  • Cloverworm – 1
  • Japanese beetle – 1
  • Grasshoppers - 1
  • Green stinkbug – 1
  • Frogeye leaf spot – 1
  • Brown spot - 1

August 28, 2017 – Cambria (Near Loretto) – Zachary Larson
Growth Stage: R6

  • Cloverworm – 1
  • Bean leaf beetle – 1
  • Bacterial blight – 1
  • Frogeye leaf spot – 2
  • Brown spot – 1

August 25, 2017 – Clinton County - Eastville – Don Woodring
Growth Stage: R4-R6

Observation

  • Grasshopper – Severity 3
  • Bean leaf beetle – Severity 1
  • Green cloverworms – Severity 2
  • Brown stinkbug – Present
  • Green stinkbug ­– Severity 1
  • Soybean aphid ­– Present
  • Japanese beetle – Present

Beneficials

  • Lady beetle ­– Well established 3

Disease

  • Sclerotinia stem rot (white mold) – Severity 1

August 25, 2017 – Clinton County - Mill hall – Don Woodring
Growth Stage: R4-R5

  • Green cloverworm – Severity 3
  • Japanese beetle – Present
  • Grasshopper – Severity 3
  • Bean leaf beetle – Severity 1
  • Green stinkbug – Severity 1
  • Soybean Aphids – Present
  • Bean Leaf Beetle – Present
  • Thistle caterpillar ­– Present
  • Soybean looper – Present

Beneficials present: Lady beetle

Disease

  • Sclerotinia stem rot (white mold) – Present

August 28, 2017 – Columbia – Joel Imgrund
Growth Stage: R6

  • Grasshoppers (3), PLH (1), Aphids (1)

August 28, 2017 – Crawford – Joel Hunter
Growth Stage: R5
New pressures:

  • Aphids 1- slight &
  • Cercospora leaf blight 1- slight
  • Still grass hopper, Japanese beetle both 1- slight.

August 28, 2017 – Greencastle – Kelly Patches
Growth Stage: R5

  • Bean leaf beetle: 1
  • Japanese beetle: 1
  • Potato leafhopper: 1
  • Aphids: 1

Beneficial insects present: spider, bee

August 28, 2017 – Kersey – Mellissa Strong
Growth Stage: R5

  • Frogeye leaf spot- Severity: 1
  • Grasshopper- Severity: 1
  • Japense Beetle- Severity: .5
  • Green Stink Bug- Seveirty: 2
  • Lady beetles: present

August 28, 2017 – Northumbeland – Joel Imgrund
Growth Stage: R6

  • Grasshoppers (4), Skipper, cloverworm, downy mildew all 1

August 23, 2017 – Stewartstown-South – Tom Lockhart
Growth Stage: R6
Damage Level = 2

Pests found:

  • Bean Leaf Beetles
  • Grasshoppers
  • Japanese Beetles
  • Green Clover Worm
  • Cucumber Beetles
  • Mexican Bean Beetle


Diseases:

  • brown spot
  • frogeye
  • downy mildew

August 23, 2017 – Stewartstown-South – Tom Lockhart
Growth Stage: R5
Damage Level = 1

Pests found:

  • grass hoppers
  • Japanese Beetles
  • Bean Leaf Beetle
  • Mexican Bean Beetles
  • Brown Marmorated Stink Bug
  • Green Stink Bug
  • Cucumber Beetle
  • Green Clover Worms
  • Silver Spotted Skipper worm

Disease:

  • brown spot
  • downy mildew

August 28, 2017 – Union – Joel Imgrund
Growth Stage: R6

  • Japanese beetle (1), Grasshoppers (4), downy mildew (1)

August 23, 2017 – Windsor – Tom Lockhart
Growth Stage: R6
Damage Level = 1

Pests found:

  • Silver Spotted Skippers
  • Japanese Beetles
  • grasshoppers
  • Bean Leaf Beetle
  • Green Stink Bug
  • Green Clover worm

Disease:

  • Frogeye
  • brown spot

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