Calliephialtes grapholithae

Systematic position: This species belongs to the order Hymenoptera and the family Ichneumonidae. These insects are well-known parasitoids that play a significant role in the trophic webs of orchard ecosystems, often interacting with lepidopteran larvae that cause damage to fruit and vegetative parts of trees.

Crops damaged: The species is primarily found in pome and stone fruit orchards. It is frequently associated with crops affected by codling moths (Cydia pomonella) and other leafrollers, as these pests serve as hosts for the developing larvae of the parasitoid wasp within the fruit tissue or bark crevices.

Biology and life cycle: The life cycle is tightly synchronized with its hosts. The female uses a long ovipositor to locate larvae hidden under tree bark or deep within fruits. Upon successful detection, the wasp deposits eggs, and the emerging larvae feed on the host. The species typically overwinters as a larva inside a cocoon within the host's gallery.

Nature of damage: While often considered a beneficial natural enemy, its influence on the orchard ecosystem is complex. The primary concern is that a shift in the population density of these insects can disrupt the natural suppression of other harmful agricultural pests, potentially leading to increased damage from primary fruit tree defoliators or borers.

Protection measures: Effective management requires a balanced approach to preserve orchard health without harming beneficial biodiversity. Key strategies include:

• Sanitation by removing dropped and infested fruit.
• Bark scraping and cleaning to destroy overwintering sites.
• Minimal use of broad-spectrum insecticides to prevent secondary pest outbreaks.
• Implementing pheromone traps for monitoring and management of host species.