Pea seed weevil

The pea seed weevil (Tychius quinquepunctatus) belongs to the order Coleoptera and the Curculionidae family. It is a specialized pest primarily affecting legume crops, causing substantial economic losses in agricultural production across various regions.

The host plants mainly include peas, vetches, and lentils. While adult beetles feed on the foliage and flower buds, the larvae cause the most significant destruction by boring into the developing pods and consuming the seeds, which significantly reduces yield and grain quality.

The biological cycle is univoltine, meaning there is only one generation per year. The adults overwinter in the soil at a depth of up to 15 centimeters. In the spring, as temperatures rise, they emerge and migrate to host fields precisely when the plants are entering the budding and flowering stages.

The damage caused by this insect leads to reduced grain weight and significantly lower germination rates. Because the larvae develop hidden inside the seed, infestations can often go unnoticed until harvest time, making early detection and prevention strategies essential for farmers.

Effective protection and control measures include:

• Implementing deep autumn plowing to disrupt the hibernation cycle of the beetles.
• Using spatial isolation by planting new legume crops away from previous infestation sites.
• Selecting early-maturing varieties to escape the peak activity of the pest.
• Applying targeted insecticides during the budding phase when the economic threshold is exceeded.