Based on Corn Earworm Blacklight Trap Catches (conservative system)
<1 |
No Spray |
1 |
6 Day |
2 |
5 Day |
3 |
4 Day |
4 |
3 Day |
38 |
2 Day |
Based on Corn Earworm Pheromone Trap Catches
Generally used as a guideline in combination with light trap catch information. Requires use of a wire mesh trap and Hercon CEW pheromone lure placed with the base of the trap at silk height in fresh silking corn. Check traps at 3 times per week throughout the growing season.
|
<0.2 |
<1 |
<1.4 |
No Spray |
0.2 - 0.5 |
1.0 - 2.5 |
1.4 - 3.5 |
6 Day |
0.5 - 1.0 |
2.5 - 5.0 |
3.5 - 7.0 |
5 Day |
1.0 - 13.0 |
5.0 - 65.0 |
7.0 - 91.0 |
4 Day |
>13.0 |
>65.0 |
>91.0 |
3 Day |
In some cases corn earworm catches are very low; however, corn borer and fall armyworm pressure is high. If no sprays are called for CEW, the following spray schedule should be used:
| ECB light trap catch is > 100 per 5 days |
4 Day |
| ECB light trap catch is 51-100 per 5 days OR FAW infestations in whorl stage corn is >30% infestation OR Sap Beetle infestation is greater than 10% |
5 Day |
| ECB light trap catch is 25 to 50 per 5 days & FAW infestations in whorl stage corn is < 30% infestation & Sap Beetle infestation is < 10% |
6 Day |
| ECB light trap catch is < 25 per 5 days & FAW infestations in whorl stage corn is < 30% infestation & Sap Beetle infestation is < 10% |
No Spray |
|
