Meteorus albicornis

Meteorus albicornis is a species of parasitic wasp belonging to the order Hymenoptera and the family Braconidae. It is widely recognized in agronomy not as a pest, but as a beneficial parasitoid that plays a crucial role in regulating the populations of various leaf-eating caterpillars in temperate climates.

The host range of this wasp includes several species of Lepidoptera, particularly geometer moths and owlet moths. These host insects are significant defoliators that can cause severe damage to deciduous trees, fruit crops, and forest plantations by consuming foliage and disrupting tree growth, making the presence of the parasitoid a natural asset to growers.

The life cycle of the wasp is highly specialized. The female uses her ovipositor to inject an egg directly into the body of the host larva. The developing parasitoid larva feeds internally on the host’s tissues, eventually killing the caterpillar upon completion of its larval stage, after which it spins a silk cocoon, often suspended by a thread, to pupate.

As a natural enemy, it does not inflict damage on agricultural crops. Instead, it provides an essential ecosystem service. By maintaining the host population below the economic injury level, Meteorus albicornis acts as a biological regulator, effectively reducing the need for broad-spectrum chemical insecticides in integrated pest management programs.

To support and preserve this beneficial species in the field, agronomists recommend the following practices:

• Avoid the use of non-selective pesticides during the adult emergence period.
• Plant floral margins or cover crops to provide essential nectar and pollen for adult wasps.
• Maintain natural habitat patches near orchards to serve as reservoirs for the parasitoid population.
• Minimize soil disturbance, as many cocoons or overwintering stages are located in the leaf litter or upper soil layers.