Eight sites reporting this week with European corn borer (ECB)-E caught at 5 of the sites, Eden, Farmington, Owego, Penn Yan and Seneca Castle and ECB-Z caught at 2 site, Penn Yan and Seneca Castle. Ten corn earworm (CEW) were caught at Eden which puts this site on a 4 day spray interval (see table at bottom of post). This is very early for CEW but not unusual for this site. Accumulated degree days for the 25 trap network sites range from 334 to 514 with an average of 438.6 modified base 50F.
ECB in early sweet corn, which was started under row cover, plastic or transplanted, does not feed in the whorl and emerge in the tassel as they do in bare ground corn and therefore the usual scouting and threshold recommendations do not apply. Target newly hatching larvae using the moth trap catches or scout for egg masses to determine when sprays are needed. Growers have had good results when pheromone trap catches were used to time sprays for the first generation ECB in row cover or plastic corn. Growers waited until there was a significant increase in the ECB trap catches in their area and then timed sprays to coincide with egg hatch. ECB eggs require 100 degree days (base 50) from oviposition to hatch. Two to three applications bracketing the peak moth flight are generally effective. See table below for accumulated degree days for each site.
J.W. Apple, Department of Entomology, University of Wisconsin-Madison
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | DD to Date |
|
| Avoca (Steuben Co.) | NA | NA | NA | NA | NA | 405.5 | |
| Avon (Livingston Co.) | NA | NA | NA | NA | NA | 498.5 | |
| Baldwinsville (Onondaga Co.) | NA | NA | NA | NA | NA | 463.8 | |
| Batavia (Genesee Co.) | NA | NA | NA | NA | NA | 334.0 | |
| Belfast (Allegany Co.) | NA | NA | NA | NA | NA | 431.8 | |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 514.0 | |
| Eden (Erie Co.) | 1 | 0 | 10 | NA | NA | 404.8 | |
| Farmington (Ontario Co.) | 5 | 0 | 0 | 0 | NA | 446.4 | |
| Hamlin (Monroe Co.) | NA | NA | NA | NA | NA | 430.8 | |
| Kennedy (Chautauqua Co.) | NA | NA | NA | NA | NA | 371.9 | |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | 485.2 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | 499.1 | |
| LeRoy (Genesee Co.) | NA | NA | NA | NA | NA | 392.9 | |
| Lockport (Niagara Co.) | 0 | 0 | 0 | 0 | NA | 403.5 | |
| Oswego (Oswego Co.) | 0 | 0 | 0 | 0 | NA | 429.0 | |
| Owego (Tioga Co.) | 4 | 0 | 0 | 0 | NA | 434.8 | |
| Pavilion (Genesee Co.) | NA | NA | NA | NA | NA | 392.9 | |
| Penn Yan (Yates Co.) | 4 | 3 | 0 | 0 | NA | 493.5 | |
| Plessis (Jefferson Co.) | NA | NA | NA | NA | NA | 409.3 | |
| Preble (Cortland Co.) | NA | NA | NA | NA | NA | 455.5 | |
| Seneca Castle (Ontario Co.) | 2 | 1 | 0 | 0 | NA | 449.5 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 485.2 | |
| Spencerport (Monroe Co.) | 0 | 0 | 0 | 0 | NA | 498.5 | |
| Waterport (Orleans Co.) | NA | NA | NA | NA | NA | 430.8 | |
| Williamson (Wayne Co.) | NA | NA | NA | NA | NA | 396.8 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (modified base 50F) accumulation |
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| trap catches for the week of 5.26.15 – 6.2.15 |
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