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Sweet Corn Pheromone Trap Network

for Western NY - 2009

This is a seasonal scouting report giving growers in the Western New York area information on the presence of sweet corn pests and recommendations on scouting and thresholds. The report is written by Abby Seaman, NYS IPM's Area Extension Educator for Vegetables.

For 9/1/09

ECB catches are down from last week at most, but not all locations.  Corn earworm numbers are lower than last week but still high enough at most locations to drive the spray schedule.  Numbers at most sites call for a 4-5 day spray schedule in green silk stage fields.  Fall armyworm numbers are up at most locations this week.  The corn earworm sprays should take care of any newly hatched armyworm or corn borer, after any larger armyworm are taken care of at tassel emergence.

Scouting and threshold information:

Once CEW are being caught in higher numbers, insecticide applications in silk stage fields should be determined by CEW trap catches.  The recommended spray intervals for CEW should be adequate for ECB and FAW control.  Because CEW lay their eggs directly on the silk, and eggs are difficult to find in the field unless the population is VERY high, we rely on pheromone trap catches rather than scouting to make CEW management decisions.  It is most important to adhere to the recommended spray intervals when the field is in the green silk stage.  The chart below indicates recommended spray intervals during the silk stage for a range of trap catches:

Per Day
Per Five Days
Per Week
Days Between Sprays
<0.2
<1.0
<1.4
No Spray (for CEW)
0.2-0.5
1.0-2.5
1.4-3.5
6 days
0.5-1.0
2.5-5.0
3.5-7.0
5 days
1-13
5-65
7-91
4 days
over 13
over 65
over 91
3 days

Location
ECB-E
ECB-Z
CEW
FAW
Avon (Livingston Co.)
0
2
18
NA
Baldwinsville (Onondaga Co.)
NA
NA
NA
NA
Batavia (Genesee Co.)
0
5
4
13
Bellona (Yates Co.)
3
4
125
280
Eden Z (Erie Co.)
0
8
8
10
Farmington (Ontario Co.)
2
1
18
0
Great Valley (Cattaraugus Co.)
NA
NA
NA
NA
Hamlin (Monroe Co.)
0
3
11
5
Kennedy (Chautauqua Co.)
NA
NA
NA
NA
King Ferry (Cayuga Co.)
0
0
33
NA
Kirkville (Madison Co.)
NA
NA
NA
NA
LeRoy (Genesee Co.)
5
2
7
6
Lockport (Niagara Co.)
0
28
14
6
Medina (Orleans Co.)
0
0
16
37
Owego (Tioga Co.)
0
2
17
0
Penn Yan (Yates Co.)
0
7
28
4
Pike (Wyoming Co.)
1
7
7
10
Plessis (Jefferson Co.)
NA
NA
NA
NA
Spencerport (Monroe Co.)
0
25
16
7
Wayland (Steuben Co.)
NA
NA
NA
NA
Williamson (Wayne Co.)
0
0
0
4