Moths and Snap Pea Processing

Moths and Snap Pea Processing

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:


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.