Olla v-nigrum

Olla v-nigrum is an insect belonging to the order Coleoptera and the family Coccinellidae. While many members of this family are considered beneficial entomophages, this species represents a specific interest for agronomists, as its feeding habits in certain environmental conditions can shift, causing it to act as a pest on various horticultural crops.

The pest primarily affects woody plants, including citrus and various fruit trees. In agricultural settings, it can colonize orchards and nurseries, feeding on leaves and young shoots, which can lead to significant physiological stress for the host plant if the population density is high.

The biology of this species involves a complete life cycle consisting of egg, larva, pupa, and adult stages. Females lay their eggs on the underside of leaves to protect them from environmental extremes. The larvae go through several instars of development, exhibiting high mobility and feeding activity before reaching the pupal stage on the surface of the plant tissue.

The damage is characterized by skeletonizing leaves and causing necrotic spots on the plant epidermis. By damaging the integrity of the leaf surface, the pest facilitates the entry of moisture and secondary pathogens, which can exacerbate the damage and lead to partial or total loss of foliage on the affected branches.

Protection measures require an integrated approach focusing on early detection. Agronomic strategies include maintaining healthy soil, promoting biodiversity to encourage natural predators, and the judicious use of biological insecticides. Chemical control should only be implemented when threshold levels are exceeded, ensuring minimal impact on the local ecosystem.

• Regular inspection of foliage density.
• Use of pheromone traps for population monitoring.
• Application of selective insecticides during the larval stage.
• Implementation of preventive sanitary pruning.