Aphids
Numbers of aphids are continuing to increase in both peas and beans as the weather remains warm. Pea aphids in combining peas should be treated with an aphicide when 20% of plants are affected and vining peas when 15% of plants are affected.

Combining peas are susceptible to yield loss up to 4 full-podded trusses and, after this growth stage, there is little benefit to applying aphicides. Always check labels for harvest intervals, particularly in vining peas.

Pea aphids may also be present in bean crops and behave in a similar manner to black bean aphids, moving down from the top of the plant and onto the top pods. Pea and black bean aphids in beans can be controlled using aphicide sprays, and those crops that still have pods to fill at the top of the plant will benefit from an application. Colonies first develop on headlands but, where there is a general infestation of 10% of plants, spraying should be carried out as soon as possible.

In the event that pirimicarb products are not available, use an alternative approved insecticide to control aphids. Further advice can be sought by calling PGRO on 01780 782585, or members can download Technical Updates 162, 173, 174 and 175 from the website www.pgro.org

Combining pea desiccation

If you are considering desiccating combining peas, the correct stage of application is important. Moisture content should be between 40-45% when the crop is turning yellow, bottom pods are parchment-like and the seed is hard. Middle pods should be pitted and crinkled, pods becoming parchment-like with rubbery seeds within. Top pods will still be fleshy and still green/yellow.

If desiccation takes place too early when insufficient lignification has taken place the haulm can collapse, the crop lodges and yield may be affected. Intervals between desiccation and harvest will vary depending upon the weather. Following applications of diquat, crops are usually ready for combining 7–10 days later. Glyphosate is available pre-harvest to control excessive green weed growth but work at PGRO has shown it has little desiccant action in peas.

Generally at least 7 days will have to elapse between application and harvest. Pre-harvest glyphosate should not be used on seed crops.