Processors and Growers Research Organisation

Pea Moth

Monitoring and forecasting has resumed for 2021.

There have been further reports of pea moth flights and numbers have increased in the last week. There have been some reports  of a threshold for combining peas being reached in traps. Traps should be in place and are available from several suppliers. 

You can contact Becky Howard on 01780 781351 if you require advice about pest management. 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

24 May

08 Jun 07 Jun 07 Jun 07 Jun 04 Jun 07 Jun 11 Jun 13 Jun

26 May

10 Jun 10 Jun 09 Jun 09 Jun 10 Jun 09 Jun 13 Jun 14 Jun

28 May

13 Jun 12 Jun 11 Jun 12 Jun 12 Jun 11 Jun 14 Jun 15 Jun

31 May

16 Jun 14 Jun 14 Jun 16 Jun 15 Jun 15 Jun 17 Jun 18 Jun

02 Jun

18 Jun 17 Jun 17 Jun 18 Jun 17 Jun 18 Jun 19 Jun 19 Jun

04 Jun

20 Jun 19 Jun 20 Jun 20 Jun 20 Jun 20 Jun 21 Jun 20 Jun
...