Mirid bug Plagiognathus repetitus

Plagiognathus repetitus is a species of plant bug belonging to the Miridae family within the order Hemiptera. As a typical representative of mirids, it is known for its piercing-sucking mouthparts that allow it to extract plant sap from various parts of its host.

This pest affects a range of crops, including cereals, forage grasses, and various vegetable species. By extracting nutrients, the insect disrupts the plant's physiological functions, leading to localized cell death and structural weakening of the plant tissues.

The life cycle typically follows a pattern of overwintering eggs laid within the host plant tissues. As temperatures rise in spring, nymphs emerge and undergo several molting stages before reaching adulthood. Multiple generations per year are possible depending on the local climate and host availability.

Symptoms of infestation include discoloration, deformation of foliage, and necrotic spots on leaves and stems. Severe damage to buds and developing flowers can significantly reduce yields. The loss of sap weakens the plant, making it more susceptible to secondary fungal or viral infections.

Integrated Pest Management (IPM) strategies include:

• Crop rotation and systematic weeding to remove alternative hosts.
• Monitoring pest density using yellow sticky cards in field borders.
• Application of selective insecticides targeting nymphal stages during peak periods.
• Biological control through the conservation of predatory hemipterans and ladybeetles.