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PestWatch Report June 28, 2017

Posted: June 29, 2017

Corn earworm (CEW) is exceeding thresholds throughout the state and European corn borer (ECB) in Bradford County to the northeast. Silking corn will be very attractive to early-season moths.
Corn Earworm is present in most sites, and above spray thresholds for silking corn in Blair and Washington County. Photo: S. Fleischer, Penn State

Corn Earworm is present in most sites, and above spray thresholds for silking corn in Blair and Washington County. Photo: S. Fleischer, Penn State

Corn earworm (CEW)

CEW was detected in 21 of 27 sites. Multiple sites throughout the state are exceeding 5-6 day spray intervals for silking corn, and sites in Centre and Westmoreland counties suggest even tighter schedules either this week or last week. Sites in the southern Hudson Valley are also high. Silking corn will strongly attract egg-laying females. This is dramatically higher than this time last year.

County Trap Name 14-Jun 21-Jun 28-Jun
Blair Tyrone, PA (Blair) null 51 null
Bradford Bristol's Produce 0 0 0
Bradford Larue's Produce null 0 null
Bradford Shores Sisters Produce 2 0 0
Bucks Bedminster 0 0 0
Centre Harner null 0 4.7
Centre Rock Springs null 1.6 2.5
Centre Stormstown null null 40.3
Clinton Loganton null null 0
Fayette Duda's Farm Inc. null 15 null
Huntingdon New Morning Farm null null 18.7
Indiana Creekside null 26 4
Lackawanna Ransom null null 0
Lancaster Landisville 0 0 9
Lancaster Neffsville 1.2 6 9
Lancaster New Danville null 2.5 null
Lehigh Germansville 2.3 4.7 22
Luzerne Drums null 0 0
Lycoming Linden null 2 null
Lycoming Montoursville null 20 null
Lycoming Muncy null 2 null
Montour Montour 4.7 null 8
Northampton Nazareth 0 0 null
Schuylkill Tower City null 1 null
Washington Venetia null 47 35
Westmoreland Schramms Farms and Orchard null
27.1
York York 0 3 28

corn earworm map 6.28.17

European corn borer (ECB)

ECB sites in Bradford County and the northeast part of the state are exceeding spray thresholds. ECB counts are starting to decline, but adult counts have been high in the northeast. Larvae generated from those adults can be controlled with a spray timed at row tassel.

County Trap Name 14-Jun 21-Jun 28-Jun
Blair Tyrone, PA (Blair) null 0 null
Bradford Bristol's Produce 105 55 22
Bradford Larue's Produce null 250.3 null
Bradford Shores Sisters Produce 40 43 17
Bucks Bedminster 0 0 0
Centre Harner null 12.3 null
Centre Rock Springs null 0 null
Clinton Loganton null null 10.4
Fayette Duda's Farm Inc. null 0 null
Huntingdon New Morning Farm null null 2.3
Indiana Creekside 0 0 0
Lackawanna Ransom null null 7
Lancaster Landisville 3.5 2 10
Lancaster Neffsville 1.2 4 8
Lancaster New Danville null 0.5 null
Lehigh Germansville 4.7 11.7 21
Luzerne Drums null 17 0
Montour Montour 16.3 1 14
Northampton Nazareth 5 16 null
Schuylkill Tower City null 1 null
Westmoreland Schramms Farms and Orchard null null 12.6
York York 0 0 0

european corn borer map 6.28.17

Average weekly catch—a moving average for the last 7 days. The average catch per night (catch, divided by the number of nights trapping), divided by the number of nights where data exist, multiplied by 7. Weeks where all the average-catch-per-night values are nulls are treated as if no data exist for that week.

PestWatch website

Spray count map legend

spray count legend

Fall armyworms (FAW)

At this time of year, capture is due to a non-target species called Leucania phragmatidicola (it does not have a common name).

Identifying Non-targets from Fall Armyworm Pheromone Captures

Thresholds

Reproductive (tassel/silk) and late vegetative corn attracts moths. Shorten spray schedules when populations increase.

Thresholds Based on CEW Captures

Levels CEW catch / week Spray frequency
almost absent 1–13 4 days to no spray
very low 14–35 5 to 6 day
low 36–70
4 to 5 day
moderate 71–349 3 to 4 day
high > 350 2 to 3 day

If CEW is low, then consider ECB

Levels ECB catch / week Spray frequency
almost absent < 14 no treatment
very low 15–35 6 day
low 38–70 5 day
moderate > 70 4 day
high

Contact Information

Shelby Fleischer
  • Professor of Entomology
Email:
Phone: 814-863-7788