Soybean Sentinel Plot Program July 26, 2017

More reports this week from across the state that uniformly indicate low pest populations in the soybean fields we are scouting.
Soybean Sentinel Plot Program July 26, 2017 - News

Updated: November 15, 2017

Soybean Sentinel Plot Program July 26, 2017

More reports this week from across the state that uniformly indicate low pest populations in the soybean fields we are scouting. Our reports from this week identify Japanese beetles, and grasshoppers as the primary defoliators. Remember that vegetative stages soybeans can tolerate up to 25% defoliation without dropping yield (reproductive stage beans can tolerate 15%), 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. 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.

Reports

24 July 2017 - Columbia County - Chris Houser/Joel Imgrund

Growth stage: R2

  • Japanese beetle - Severity: 1
  • Grasshoppers - Severity: 1
  • Potato leaf hoppers - Severity: 1
  • Beneficial insects present: Many honey bees & bumble bees
  • No diseases noted

24 July 2017 - Northumberland County - Chris Houser/Joel Imgrund

Growth stage: R2

  • Japanese beetle - Severity: 1
  • Grasshoppers - Severity: 2
  • Honey bees present
  • No diseases noted

24 July 2017 - Union County - Chris Houser/Joel Imgrund

Growth stage: R1

  • Japanese beetle - Severity: 2
  • Grasshoppers - Severity: 3
  • Green cloverworm - Severity: 1
  • Beneficial insects present: Honey bees & bumble bees
  • No diseases noted

23 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

  • Japanese beetle - Severity: 1
  • Septoria brown spot - Severity: 1

23 July 2017 - Jefferson County - Nicole Carutis/Mellissa Rathbu

Near Brockway

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

Growth stage- V3

  • Japanese beetle - Severity: 1
  • Bean leaf beetle - Severity: 1
  • Grasshopper - Severity: 1
  • Beneficial arthropods present: spiders
  • Frogeye leaf spot - Severity: 1

21 July 2017 - Franklin County - Kelly Patches

Near Greencastle

Growth stage: R2

  • Japanese beetle - Severity: 3
  • Green cloverworm - Severity: 3
  • Bean leaf beetle - Severity: 2
  • Potato leaf hopper - Severity: 1
  • Grasshoppers - Severity: 1
  • Beneficial arthropods present: spiders, lacewing, spined soldier bug
  • No diseases noted

21 July 2017 - Franklin County - Kelly Patches

Near Fayetteville

Growth stage: R2

A few weeks ago, field was sprayed with a post-emergent herbicide, and they unnecessarily include an insecticide

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

20 July 2017 - Clinton County - Don Woodring

Near Eastville

Growth stage: V6-R1

  • Japanese beetle - Severity: 1
  • Grasshopper present
  • Potato leafhopper present
  • No diseases noted

20 July 2017 - Clinton County - Don Woodring

Near Mill Hall

Growth stage: V4-5

  • Japanese beetle - Severity: 1
  • Grasshopper - Severity: 1
  • Green cloverworm present
  • No diseases noted

19 July 2017 - York County - John Rowehl/Tom Lockhart

Near southern Stewartstown

Growth stage: R2

  • Bean leaf beetle - Severity: 1
  • Japanese beetle - Severity: 1
  • Green cloverworm - Severity: 1
  • Grasshoppers - Severity: 1
  • No diseases noted

19 July 2017 - York County - John Rowehl/Tom Lockhart

Near eastern Stewartstown

Growth stage: V6-7

  • Japanese beetle - Severity: 1
  • Grasshoppers - Severity: 1
  • No diseases noted

19 July 2017 - York County - John Rowehl/Tom Lockhart

Near Windsor

Growth stage: R1

  • Mexican bean beetles - Severity: 1
  • Japanese beetle - Severity: 1
  • Grasshoppers - Severity: 1
  • Bean leaf beetles - Severity: 1
  • Brown marmorated stink bug - Severity: 1
  • Green cloverworm - Severity: 1
  • Thrips - Severity: 1
  • No diseases noted

21 July 2017 Cambria County - Zack Larson

Loretto

Growth stage: R1

  • Japanese Beetles - Severity: 1
  • Cloverworm - Severity: 1
  • Soybean aphids - Severity: 1
  • Lightning bugs
  • No disease

24 July 2017 Armstrong County - Rachel Milliron

Dayton

Growth stage: R2

  • Japanese Beetles - Severity: 2
  • Grasshoppers - Severity: 1
  • Bean Leaf Beetles - Severity: 2
  • Septoria - Severity: 1

24 July 2017 Blair County - Zach Larson

Martinsburg

Growth stage: R3

  • Japanese Beetles - Severity: 1
  • Cloverworm - Severity: 1
  • Grasshoppers - Severity: 1
  • Brown spot - Severity: 1

24 July 2017 Crawford County - Joel Hunter

Saegertown

Growth stage: R2

  • Japanese Beetles - Severity: 1
  • Brown spot - Severity: 1

Authors

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

More by John Tooker, Ph.D.