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Sweet Corn Pheromone Trap Network for Western New York, 2010

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.

see previous issues below

For 9/7/10

Corn earworm catches remain high enough at many locations to call for a 4-5 day spray interval in green silk stage corn, given the temperatures predicted for the rest of the week. Keep in mind that as the number of attractive (green silk stage) fields decreases, less attractive fields will experience more pressure.  I am finding CEW larvae in the corn Iím buying for dinner.  Itís OK with me but may not be for your customers.  ECB-E race moths remain uniformly low.  Z race catches are now mostly in the single digits.  Fall armyworm catches remain variable across the region, ranging from 0 to 101.  Only a concern if spray schedules are not being determined by corn earworm catches.  A few western bean cutworm moths were caught this week.

Where corn earworm are being caught, 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
Add one day to the recommended spray interval if daily maximum temperatures are less than 80į F for the previous 2-3 days.
 
Location
ECB-E
ECB-Z
CEW
FAW
WBC
Avoca (Steuben Co.)
0
0
11
NA
0
Avon (Livingston Co.)
0
0
90
NA
0
Baldwinsville (Onondaga Co.)
NA
NA
NA
NA
NA
Batavia (Genesee Co.)
NA
NA
NA
NA
NA
Bellona (Yates Co.)
9
15
28
1
0
Eden Z (Erie Co.)
NA
NA
NA
NA
NA
Farmington (Ontario Co.)
1
NA
11
2
1
Great Valley (Cattaraugus Co.)
NA
NA
NA
NA
NA
Hamlin (Monroe Co.)
2
3
205
33
0
Kennedy (Chautauqua Co.)
3
3
51
101
1
King Ferry (Cayuga Co.)
0
0
9
7
4
Kirkville (Madison Co.)
NA
NA
NA
NA
NA
LeRoy (Genesee Co.)
0
4
46
12
0
Lockport (Niagara Co.)
0
0
13
7
0
Medina (Orleans Co.)
NA
NA
NA
NA
NA
Owego (Tioga Co.)
0
1
1
NA
NA
Penn Yan (Yates Co.)
1
0
85
5
1
Pike (Wyoming Co.)
NA
NA
NA
NA
NA
Plessis (Jefferson Co.)
NA
NA
NA
NA
NA
Preble (Cortland Co.)
0
0
83
0
NA
Sherwood (Cayuga Co.)
0
0
127
6
NA
Spencerport (Monroe Co.)
0
0
17
5
0
Williamson (Wayne Co.)
NA
NA
NA
NA
NA