| ECB and CEW moth catch thresholds for processing snap beans |
| (bud stage - harvest) |
| European corn borer (ECB) |
| 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: |
| Thresholds: |
|
Number ECB Moths per 5 Days
|
Spray Interval
|
|
Less than 10
|
No Spray
|
|
11 - 25
|
7 Day
|
|
25 - 50
|
6 Day
|
|
51 - 75
|
5 Day
|
|
76 - 250
|
4 Day
|
|
250 +
|
3 Day
|
| Corn earworm (CEW) |
| 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. |