Processors and Growers Research Organisation

Pea Moth

Forecasting has started for 2023.

There have been reports of pea moths in traps in high numbers. The table below gives predicted spray dates based on threshold catches in traps. For further information about pea moth or any other pest or disease, please call PGRO on 01780 782585.

It’s important to monitor pea moth presence on your farm using pheromone traps to help us provide accurate spray forecasts or other management advice for you.

A spray date is displayed below during the forecasting period, based on a model prediction, and should be checked 3 - 4 days after reaching a threshold in your traps.

The forecast is also regularly updated on the PGRO pea and bean APP during the season.

Traps should be placed in pea crops in early to mid-May and monitored three times each week. In combining peas, a threshold is reached when 10 or more moths are caught in a trap on two consecutive occasions. In vining peas a lower threshold of damage is tolerated and traps should be used as an indication of moth presence.

Threshold dates may vary for different regions and it is important to monitor populations in your region to accurately predict spray date. Timing of sprays is related to egg development and this is affected by temperature. Control of the larvae must be carried out following egg-hatch and before they reach the pod, and the forecasting system accurately predicts this.

On the predicted spray date, crops which are at the first pod set stage or which have flowered should be sprayed, but later crops should only be sprayed when they reach first pod set. Crops with green pods are susceptible to damage. A second application should be applied 10-14 days later.

Predicted spray date for regions based on your threshold in pheromone traps

Threshold Date from your trap catches East S. East S. West E. Mids W. Mids Wales North Borders
22-Jun 30-Jun 30-Jun 01-Jul 01-Jul 30-Jun 02-Jul 02-Jul 03-Jul
25-Jun 05-Jul 05-Jul 05-Jul 05-Jul 05-Jul 06-Jul 07-Jul 07-Jul
27-Jun 08-Jul 07-Jul 08-Jul 09-Jul 09-Jul 09-Jul 09-Jul 10-Jul
01-Jul 13-Jul 12-Jul 13-Jul 14-Jul 13-Jul 13-Jul 15-Jul 15-Jul
07-Jul 17-Jul 17-jul 18-Jul 17-Jul 17-Jul 18-Jul 17-Jul 18-Jul
09-Jul 20-Jul 20-Jul 20-Jul 20-Jul 20-Jul 20-Jul 20-Jul 20-Jul