(bud stage - harvest)
Sampling: Sampling is based on monitoring moth catches in local blacklight traps. For the most precise decisions, traps should be placed within one mile of each field. Traps should be serviced 3 times per week, preferably daily when moth activity increases.
The most critical time for corn borer treatment occurs at the bud-early bloom and pin stages. As a general guideline, treatment should begin when trap catches average 5 ECB moths per night. However, if moths can be observed readily in a field and trap catches have not reached 5 per night, sprays should still be applied at the bud-early bloom and pin stages. After the pin spray, the following thresholds and spray intervals should be used:
Less than 10 |
No Spray |
11 - 25 |
7 Day |
25 - 50 |
6 Day |
51 - 75 |
5 Day |
76 - 250 |
4 Day |
250 + |
3 Day |
Sampling: Blacklight traps, pheromone traps, and direct observation of moths in fields should be used to monitor moth activity. A standard drop cloth can be used to detect small larvae.
Thresholds: As a general guideline, sprays should be applied on a 3-7 day schedule when blacklight trap catches exceed 20 per night. The spray interval will vary depending on corn borer moth activity and temperature.
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