Lagynotomus

Lagynotomus is a genus of insects belonging to the family Miridae (plant bugs) within the order Hemiptera. These pests are primarily found in regions with temperate and subtropical climates, where they thrive on both wild grasses and cultivated cereal crops.

This pest affects a wide range of agricultural crops, including wheat, barley, oats, and other cereals. Both nymphs and adults feed on plant sap, piercing stems, leaves, and ears during the grain development stage, which leads to significant losses in biomass and a decrease in harvest quality.

The biology of Lagynotomus is characterized by incomplete metamorphosis. The life cycle consists of the egg stage, five nymphal instars, and the adult stage. Overwintering typically occurs as an adult in plant debris or the top layer of the soil, with mass appearance usually observed in late spring and early summer.

The character of damage appears as chlorotic spots, leaf deformation, and partial or complete drying of the grain spikes. When the population density is high, shriveled grain and reduced test weight are common, often resulting in significant yield losses of up to 15–20% in severe cases.

Effective protection requires a combination of agrotechnical and chemical strategies. Key control measures include:

• Removal of weed vegetation along field margins.
• Implementation of crop rotation to break the life cycle.
• Stubble cultivation and deep plowing to destroy overwintering sites.
• Application of systemic insecticides when the economic threshold is exceeded.