Pea midge

The pea midge (Contarinia pisi) is a member of the order Diptera and the family Cecidomyiidae. It is considered a serious agricultural pest that specifically targets pea crops, capable of causing significant yield losses in regions where pulses are intensively cultivated.

This pest exclusively infests pea plants. The larvae feed inside the flower buds and young pods, causing characteristic swelling and malformation. As a result, the infested blossoms turn yellow or brown and eventually wither, preventing the development of seeds within the pod and directly impacting the harvest quality and quantity.

The biological cycle of this midge is univoltine, meaning it produces only one generation per year. The larvae overwinter in the soil within protective cocoons. As temperatures rise in spring, pupation occurs, and the adult midges emerge synchronously with the budding stage of the pea crop, allowing immediate colonization of the host plant.

Female midges deposit eggs into the developing flower buds. Upon hatching, the larvae penetrate the delicate tissues of the ovaries to feed. This feeding activity is the main source of damage. Once fully fed, the larvae exit the plant tissues and drop to the soil, where they burrow to overwinter until the following spring.

Effective management strategies require a combination of cultural and chemical controls. Rotating crops to separate new plantings from previous pea fields and plowing the soil deeply in autumn are crucial to disturb the overwintering population. In cases of severe infestations, chemical control using targeted insecticides should be timed precisely to the budding stage before the larvae are protected inside the flower buds.

• Crop rotation to avoid fields previously infested with peas.
• Deep autumn tillage to bury overwintering larvae.
• Selection of early-maturing pea varieties.
• Application of insecticides during the early bud formation stage.