Pistachio seed wasp

The Pistachio seed wasp (lat. Eurytoma plotnikovi) is a highly specialized agricultural pest belonging to the order Hymenoptera and the family Eurytomidae. It is considered one of the most destructive insects affecting commercial pistachio orchards, capable of causing devastating economic losses.

This pest exclusively targets the fruits of the pistachio tree (Pistacia vera). The larvae feed inside the developing nut, completely consuming the seed. This activity destroys the kernel, rendering the pistachio crop unsellable and reducing the overall vigor of the orchard's production cycle.

The biological cycle of the pistachio seed wasp is strictly synchronized with the phenology of the host plant. The larvae overwinter inside infected nuts that remain on the tree or fall to the ground. In the spring, they pupate, and the emergence of adults coincides with the development of young pistachio fruit, where the females deposit their eggs.

Damage caused by Eurytoma plotnikovi is typically internal and often goes undetected until late in the season. Affected nuts may remain on the branch, appearing healthy from the outside while being hollowed out internally. Significant infestations can lead to the loss of up to 80% of the harvest if not managed properly.

Integrated pest management (IPM) is essential for controlling this species:

• Sanitation practices, including the removal and destruction of all mummified nuts from trees and the ground.
• Monitoring adult flight periods using traps to determine the optimal timing for chemical intervention.
• Application of selective insecticides during the period of female egg-laying and initial larval penetration.
• Encouraging natural predators and parasitoids that can help suppress pest population levels naturally.